Fix JavaScript alerts from frames with oopif on, after a cross-process click.

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index 181aae71d2c91cdfd9a41b0f875f5ef1d35398ee..5a19754c5de335d397e4f46cdd906d0b956dbdee 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -799,6 +799,7 @@ class CONTENT_EXPORT RenderFrameImpl
               const blink::WebFindOptions& options);
   void OnStopFinding(StopFindAction action);
   void OnEnableViewSourceMode();
+  void OnSuppressDialogsUntilSwapOut();
 #if defined(OS_ANDROID)
   void OnActivateNearestFindResult(int request_id, float x, float y);
   void OnFindMatchRects(int current_version);
@@ -1204,6 +1205,11 @@ class CONTENT_EXPORT RenderFrameImpl
   // Whether or not this RenderFrame is currently pasting.
   bool is_pasting_;
 
+  // Whether we must stop creating nested message loops for modal dialogs until
+  // OnSwapOut is called.  This is necessary because modal dialogs have a
+  // PageGroupLoadDeferrer on the stack that interferes with swapping out.
+  bool suppress_dialogs_until_swap_out_;
+
 #if defined(ENABLE_WEBVR)
   // The VR dispatcher attached to the frame, lazily initialized.
   scoped_ptr<VRDispatcher> vr_dispatcher_;