Remove obsolete scale related APIs for cursor

ash/wm/ash_native_cursor_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/wm/ash_native_cursor_manager.h"
 
 #include "ash/display/cursor_window_controller.h"
 #include "ash/display/display_controller.h"
 #include "ash/shell.h"
 #include "ash/wm/image_cursors.h"
@@ skipping 102 matching lines @@
   // Sets the cursor to reflect the scale change immediately.
   if (delegate->IsCursorVisible())
     SetCursor(delegate->GetCursor(), delegate);
 
 #if defined(OS_CHROMEOS)
   Shell::GetInstance()->display_controller()->cursor_window_controller()->
       SetCursorSet(cursor_set);
 #endif
 }
 
-void AshNativeCursorManager::SetScale(
-    float scale,
-    ::wm::NativeCursorManagerDelegate* delegate) {
-  image_cursors_->SetScale(scale);
-  delegate->CommitScale(scale);
-
-  // Sets the cursor to reflect the scale change immediately.
-  SetCursor(delegate->GetCursor(), delegate);
-}
-
 void AshNativeCursorManager::SetVisibility(
     bool visible,
     ::wm::NativeCursorManagerDelegate* delegate) {
   delegate->CommitVisibility(visible);
 
   if (visible) {
     SetCursor(delegate->GetCursor(), delegate);
   } else {
     gfx::NativeCursor invisible_cursor(ui::kCursorNone);
     image_cursors_->SetPlatformCursor(&invisible_cursor);
@@ skipping 13 matching lines @@
         disabled_cursor_location_);
   } else {
     disabled_cursor_location_ = aura::Env::GetInstance()->last_mouse_location();
   }
 
   SetVisibility(delegate->IsCursorVisible(), delegate);
   NotifyMouseEventsEnableStateChange(enabled);
 }
 
 }  // namespace ash