Revert of Rename MaximizeMode to TabletMode

ash/shell_observer.h

Index: ash/shell_observer.h
diff --git a/ash/shell_observer.h b/ash/shell_observer.h
index 562897028bea6264e3c76b2bf78055e9b6818841..a98700afff3dd92f099932c9e5b5bde3ab988318 100644
--- a/ash/shell_observer.h
+++ b/ash/shell_observer.h
@@ -50,16 +50,16 @@
   // Called after overview mode has ended.
   virtual void OnOverviewModeEnded() {}
 
-  // Called when the always tablet mode has started. Windows might still
+  // Called when the always maximize mode has started. Windows might still
   // animate though.
-  virtual void OnTabletModeStarted() {}
+  virtual void OnMaximizeModeStarted() {}
 
-  // Called when the tablet mode is about to end.
-  virtual void OnTabletModeEnding() {}
+  // Called when the maximize mode is about to end.
+  virtual void OnMaximizeModeEnding() {}
 
-  // Called when the tablet mode has ended. Windows may still be
+  // Called when the maximize mode has ended. Windows may still be
   // animating but have been restored.
-  virtual void OnTabletModeEnded() {}
+  virtual void OnMaximizeModeEnded() {}
 
   // Called when keyboard is activated/deactivated in |root_window|.
   virtual void OnVirtualKeyboardStateChanged(bool activated,