[OSL-RV] Temporary memory increase mitigation

This is a change that will hopefully help us understand the regression
and in the long run propose a reasonable trade off between memory
cost of view reuse, performance and functionality we get.

As an added bonus, this should make the view creation numbers match
those of a ListView more closely.

Bug: 1087720, 1087691
Change-Id: Iaaccb17f1eaa59058179e476ef303cfdaff68611
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225128
Commit-Queue: Filip Gorski <fgorski@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773788}

chrome/android/java/src/org/chromium/chrome/browser/omnibox/suggestions/OmniboxSuggestionsRecyclerView.java

@@ -146,6 +146,12 @@ public class OmniboxSuggestionsRecyclerView
         super.setAdapter(mAdapter);
     }
 
+    @Override
+    protected void onDetachedFromWindow() {
+        super.onDetachedFromWindow();
+        getRecycledViewPool().clear();
+    }
+
     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         try (TraceEvent tracing = TraceEvent.scoped("OmniboxSuggestionsList.Measure");