ui: Make gfx::Point::Scale() mutate the class, similar to gfx::Rect.

webkit/glue/webcursor_aurax11.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 "webkit/glue/webcursor.h"
 
 #include <X11/Xcursor/Xcursor.h>
 #include <X11/Xlib.h>
 #include <X11/cursorfont.h>
 
@@ skipping 18 matching lines @@
   XcursorImage* image = NULL;
   if (scale_factor_ == 1.f) {
     image = ui::SkBitmapToXcursorImage(&bitmap, hotspot_);
   } else {
     gfx::Size scaled_size = gfx::ToFlooredSize(
         custom_size_.Scale(scale_factor_));
     SkBitmap scaled_bitmap = skia::ImageOperations::Resize(bitmap,
         skia::ImageOperations::RESIZE_BETTER,
         scaled_size.width(),
         scaled_size.height());
-    image = ui::SkBitmapToXcursorImage(&scaled_bitmap,
-                                       gfx::ToFlooredPoint(
-                                           hotspot_.Scale(scale_factor_)));
+    gfx::Point hotspot_point = gfx::ToFlooredPoint(
+        gfx::ScalePoint(hotspot_, scale_factor_));
+    image = ui::SkBitmapToXcursorImage(&scaled_bitmap, hotspot_point);
   }
   platform_cursor_ = ui::CreateReffedCustomXCursor(image);
   return platform_cursor_;
 }
 
 void WebCursor::SetScaleFactor(float scale_factor) {
   if (scale_factor_ == scale_factor)
     return;
 
   scale_factor_ = scale_factor;
@@ skipping 30 matching lines @@
 
 void WebCursor::CopyPlatformData(const WebCursor& other) {
   if (platform_cursor_)
     ui::UnrefCustomXCursor(platform_cursor_);
   platform_cursor_ = other.platform_cursor_;
   if (platform_cursor_)
     ui::RefCustomXCursor(platform_cursor_);
 
   scale_factor_ = other.scale_factor_;
 }