Update Context Client Visibility to use Scoped Pattern

android_webview/browser/aw_render_thread_context_provider.cc

Index: android_webview/browser/aw_render_thread_context_provider.cc
diff --git a/android_webview/browser/aw_render_thread_context_provider.cc b/android_webview/browser/aw_render_thread_context_provider.cc
index 8e82beda8d49de7cfa64f0edcceb5f7e5a5807f8..0e514cb1bc64309b46d97296fc9176c5a8fdf0fb 100644
--- a/android_webview/browser/aw_render_thread_context_provider.cc
+++ b/android_webview/browser/aw_render_thread_context_provider.cc
@@ -138,6 +138,8 @@ void AwRenderThreadContextProvider::DeleteCachedResources() {
                          TRACE_EVENT_SCOPE_THREAD);
     gr_context_->freeGpuResources();
   }
+
+  ContextSupport()->TrimResources();
 }
 
 void AwRenderThreadContextProvider::SetLostContextCallback(