aw: Remove global AllowWait on UI thread

content/browser/android/synchronous_compositor_browser_filter.cc

Index: content/browser/android/synchronous_compositor_browser_filter.cc
diff --git a/content/browser/android/synchronous_compositor_browser_filter.cc b/content/browser/android/synchronous_compositor_browser_filter.cc
index 1db0063b15594cef805e32165810a200da0f529c..c04a4fb31aa38552e8106563411bd977d4b456da 100644
--- a/content/browser/android/synchronous_compositor_browser_filter.cc
+++ b/content/browser/android/synchronous_compositor_browser_filter.cc
@@ -191,11 +191,14 @@ void SynchronousCompositorBrowserFilter::VSyncComplete() {
   std::vector<SyncCompositorCommonRendererParams> params;
   params.reserve(compositor_host_pending_renderer_state_.size());
 
-  if (!render_process_host_->Send(
-          new SyncCompositorMsg_SynchronizeRendererState(routing_ids,
-                                                         &params))) {
-    compositor_host_pending_renderer_state_.clear();
-    return;
+  {
+    base::ThreadRestrictions::ScopedAllowWait wait;
+    if (!render_process_host_->Send(
+            new SyncCompositorMsg_SynchronizeRendererState(routing_ids,
+                                                           &params))) {
+      compositor_host_pending_renderer_state_.clear();
+      return;
+    }
   }
 
   if (compositor_host_pending_renderer_state_.size() != params.size()) {