Don't animate the download shelf when entering/exiting fullscreen.

chrome/browser/ui/browser.h

Index: chrome/browser/ui/browser.h
diff --git a/chrome/browser/ui/browser.h b/chrome/browser/ui/browser.h
index dce38b644a549d05d094ef33e73bc8a20a5bad41..ba7c811cb84770389580476b29aa431476c1cb5a 100644
--- a/chrome/browser/ui/browser.h
+++ b/chrome/browser/ui/browser.h
@@ -368,9 +368,10 @@ class Browser : public TabStripModelObserver,
 
   // External state change handling ////////////////////////////////////////////
 
-  // Invoked when the fullscreen state of the window changes.
-  // BrowserWindow::EnterFullscreen invokes this after the window has become
-  // fullscreen.
+  // BrowserWindow::EnterFullscreen invokes WindowFullscreenStateWillChange at
+  // the beginning of a fullscreen transition, and WindowFullscreenStateChanged
+  // at the end.
+  void WindowFullscreenStateWillChange();
   void WindowFullscreenStateChanged();
 
   // Assorted browser commands ////////////////////////////////////////////////