Ash: Inline InitKeyboard, and make the caller of it call CreateKeyboard.

ash/shell.h

Index: ash/shell.h
diff --git a/ash/shell.h b/ash/shell.h
index 72a1e8dc2ca8ae4705b30037d0c6fdaa015e84b0..9ade6b9e9734fbc21bb39d7a8d875e8f220ff167 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -287,8 +287,8 @@ class ASH_EXPORT Shell : public SessionObserver,
   // Called when a root window is created.
   void OnRootWindowAdded(aura::Window* root_window);
 
-  // Creates a virtual keyboard. Deletes the old virtual keyboard if it already
-  // exists.
+  // Creates a keyboard controller and associate it with the primary root window
+  // controller. Destroys the old keyboard controller if it already exists.
   void CreateKeyboard();
 
   // Deactivates the virtual keyboard.
@@ -627,9 +627,6 @@ class ASH_EXPORT Shell : public SessionObserver,
 
   void Init(const ShellInitParams& init_params);
 
-  // Initializes virtual keyboard controller.
-  void InitKeyboard();
-
   // Initializes the root window so that it can host browser windows.
   void InitRootWindow(aura::Window* root_window);