Fix scroll restoration when exiting fullscreen mode.

content/public/browser/web_contents_observer.h

Index: content/public/browser/web_contents_observer.h
diff --git a/content/public/browser/web_contents_observer.h b/content/public/browser/web_contents_observer.h
index 3d770b73791e7f2c108a1707830aa750911e9a8a..45efd4360ad4ac89970323c0bbfc47c95252bf5f 100644
--- a/content/public/browser/web_contents_observer.h
+++ b/content/public/browser/web_contents_observer.h
@@ -407,7 +407,8 @@ class CONTENT_EXPORT WebContentsObserver : public IPC::Listener,
 
   // Invoked when the renderer process has toggled the tab into/out of
   // fullscreen mode.
-  virtual void DidToggleFullscreenModeForTab(bool entered_fullscreen) {}
+  virtual void DidToggleFullscreenModeForTab(bool entered_fullscreen,
+                                             bool will_cause_resize) {}
 
   // Invoked when an interstitial page is attached or detached.
   virtual void DidAttachInterstitialPage() {}