For #24108 - Use Layer3 for swipe to delete background color

app/src/main/res/drawable/session_background.xml

@@ -6,5 +6,5 @@
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
     android:shape="rectangle">
     <corners android:radius="@dimen/tab_corner_radius" />
-    <solid android:color="?swipeDeleteBackground" />
+    <solid android:color="?layer3" />
 </shape>

app/src/main/res/drawable/swipe_delete_background.xml

@@ -4,5 +4,5 @@
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
     android:shape="rectangle">
-    <solid android:color="@color/swipe_delete_background_normal_theme" />
+    <solid android:color="@color/fx_mobile_layer_color_3" />
 </shape>

app/src/main/res/drawable/tab_in_collection_last_swipe_background.xml

@@ -6,5 +6,5 @@
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
        android:shape="rectangle">
     <corners android:bottomLeftRadius="@dimen/tab_corner_radius" android:bottomRightRadius="@dimen/tab_corner_radius" />
-    <solid android:color="?swipeDeleteBackground" />
+    <solid android:color="?layer3" />
 </shape>

app/src/main/res/drawable/tab_in_collection_swipe_background.xml

@@ -5,5 +5,5 @@
 
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
        android:shape="rectangle">
-    <solid android:color="?swipeDeleteBackground" />
+    <solid android:color="?layer3" />
 </shape>

app/src/main/res/values-night/colors.xml

@@ -132,7 +132,6 @@
     <color name="fill_link_from_clipboard_normal_theme">@color/photonViolet40</color>
     <color name="sync_disconnected_icon_fill_normal_theme">#FFF36E</color>
     <color name="sync_disconnected_background_normal_theme">#5B5846</color>
-    <color name="swipe_delete_background_normal_theme">@color/photonDarkGrey20</color>
     <color name="onboarding_illustration_selected_normal_theme">@color/accent_normal_theme</color>
     <color name="onboarding_illustration_deselected_normal_theme">#99FBFBFE</color>
     <color name="add_on_private_browsing_exterior_circle_background_normal_theme">@color/accent_normal_theme</color>

app/src/main/res/values/attrs.xml

@@ -69,7 +69,6 @@
     <attr name="fillLinkFromClipboard" format="reference"/>
     <attr name="syncDisconnected" format="reference" />
     <attr name="syncDisconnectedBackground" format="reference" />
-    <attr name="swipeDeleteBackground" format="reference" />
     <attr name="onboardingDarkGradientStartBackground" format="reference" />
     <attr name="onboardingDarkGradientEndBackground" format="reference" />
     <attr name="onboardingSelected" format="reference"/>

app/src/main/res/values/colors.xml

@@ -259,7 +259,6 @@
     <color name="neutral_faded_private_theme">#1FFBFBFE</color>
     <color name="sync_disconnected_icon_fill_private_theme">@color/photonYellow70</color>
     <color name="sync_disconnected_background_private_theme">#5B5846</color>
-    <color name="swipe_delete_background_private_theme">@color/photonInk20</color>
     <color name="onboarding_illustration_deselected_private_theme">#99FBFBFE</color>
     <color name="prompt_login_edit_text_cursor_color_private_theme">@color/photonViolet50</color>
 
@@ -271,7 +270,6 @@
     <color name="fill_link_from_clipboard_normal_theme">@color/photonInk20</color>
     <color name="sync_disconnected_icon_fill_normal_theme">@color/photonYellow70</color>
     <color name="sync_disconnected_background_normal_theme">#FFFDE2</color>
-    <color name="swipe_delete_background_normal_theme">@color/photonLightGrey30</color>
     <color name="onboarding_illustration_selected_normal_theme">@color/photonViolet70</color>
     <color name="onboarding_illustration_deselected_normal_theme">@color/photonDarkGrey90A60</color>
     <color name="add_on_private_browsing_exterior_circle_background_normal_theme">@color/photonViolet70</color>

app/src/main/res/values/styles.xml

@@ -93,7 +93,6 @@
         <item name="fillLinkFromClipboard">@color/fill_link_from_clipboard_normal_theme</item>
         <item name="syncDisconnected">@color/sync_disconnected_icon_fill_normal_theme</item>
         <item name="syncDisconnectedBackground">@color/sync_disconnected_background_normal_theme</item>
-        <item name="swipeDeleteBackground">@color/swipe_delete_background_normal_theme</item>
         <item name="onboardingDarkGradientStartBackground">@color/photonViolet70</item>
         <item name="onboardingDarkGradientEndBackground">@color/photonViolet40</item>
         <item name="onboardingSelected">@color/onboarding_illustration_selected_normal_theme</item>
@@ -284,7 +283,6 @@
         <item name="fillLinkFromClipboard">@color/accent_high_contrast_private_theme</item>
         <item name="syncDisconnected">@color/sync_disconnected_icon_fill_private_theme</item>
         <item name="syncDisconnectedBackground">@color/sync_disconnected_background_private_theme</item>
-        <item name="swipeDeleteBackground">@color/swipe_delete_background_private_theme</item>
         <item name="onboardingDarkGradientStartBackground">@color/photonViolet60</item>
         <item name="onboardingDarkGradientEndBackground">@color/photonPurple50</item>
         <item name="onboardingSelected">@color/accent_private_theme</item>