Allow dynamic switching in and out of sidetabs mode.

chrome/browser/views/frame/browser_frame.h

Index: chrome/browser/views/frame/browser_frame.h
===================================================================
--- chrome/browser/views/frame/browser_frame.h	(revision 41630)
+++ chrome/browser/views/frame/browser_frame.h	(working copy)
@@ -41,10 +41,6 @@
   // construction.
   virtual views::Window* GetWindow() = 0;
 
-  // Notification that the tab strip has been created. This should let the
-  // BrowserRootView know about it so it can enable drag and drop.
-  virtual void TabStripCreated(BaseTabStrip* tabstrip) = 0;
-
   // Determine the distance of the left edge of the minimize button from the
   // left edge of the window. Used in our Non-Client View's Layout.
   virtual int GetMinimizeButtonOffset() const = 0;
@@ -74,6 +70,10 @@
   // calls this method _after_ the TabStrip has painted itself so the shadow is
   // rendered above the tabs.
   virtual void PaintTabStripShadow(gfx::Canvas* canvas) = 0;
+
+  // Notifies the frame that the tab strip display mode changed so it can update
+  // its frame treatment if necessary.
+  virtual void TabStripDisplayModeChanged() = 0;
 };
 
 #endif  // CHROME_BROWSER_VIEWS_FRAME_BROWSER_FRAME_H_