[fenix] Code cleanup - Remove unused FindInPageBarBehavior

There is a "unused" lint suppression in place with the comment
"Referenced from XML". I found no such usage.
It's documentation says that this Behavior will always position FindInPageBar
above BrowserToolbar but the current code ensures
BrowserToolbar.visibility == GONE when FindInPageBar.visibility == VISIBLE
so there's no need for such behavior.

app/src/main/java/org/mozilla/fenix/components/FindInPageIntegration.kt

@@ -4,17 +4,13 @@
 
 package org.mozilla.fenix.components
 
-import android.content.Context
-import android.util.AttributeSet
 import android.view.View
 import android.view.ViewStub
-import androidx.coordinatorlayout.widget.CoordinatorLayout
 import mozilla.components.browser.session.SessionManager
 import mozilla.components.browser.session.runWithSessionIdOrSelected
 import mozilla.components.browser.toolbar.BrowserToolbar
 import mozilla.components.concept.engine.EngineView
 import mozilla.components.feature.findinpage.FindInPageFeature
-import mozilla.components.feature.findinpage.view.FindInPageBar
 import mozilla.components.feature.findinpage.view.FindInPageView
 import mozilla.components.support.base.feature.LifecycleAwareFeature
 import org.mozilla.fenix.test.Mockable
@@ -44,42 +40,3 @@ class FindInPageIntegration(
         }
     }
 }
-
-/**
- * [CoordinatorLayout.Behavior] that will always position the [FindInPageBar] above the [BrowserToolbar] (including
- * when the browser toolbar is scrolling or performing a snap animation).
- */
-@Suppress("unused") // Referenced from XML
-class FindInPageBarBehavior(
-    context: Context,
-    attrs: AttributeSet
-) : CoordinatorLayout.Behavior<FindInPageBar>(context, attrs) {
-    override fun layoutDependsOn(
-        parent: CoordinatorLayout,
-        child: FindInPageBar,
-        dependency: View
-    ): Boolean {
-        if (dependency is BrowserToolbar) {
-            return true
-        }
-
-        return super.layoutDependsOn(parent, child, dependency)
-    }
-
-    override fun onDependentViewChanged(
-        parent: CoordinatorLayout,
-        child: FindInPageBar,
-        dependency: View
-    ): Boolean {
-        return if (dependency is BrowserToolbar) {
-            repositionFindInPageBar(child, dependency)
-            true
-        } else {
-            false
-        }
-    }
-
-    private fun repositionFindInPageBar(findInPageView: FindInPageBar, toolbar: BrowserToolbar) {
-        findInPageView.translationY = (toolbar.translationY + toolbar.height * -1.0).toFloat()
-    }
-}