Make gfx::Rect class operations consistently mutate the class they are called on.

ui/views/widget/tooltip_manager_win.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 "ui/views/widget/tooltip_manager_win.h"
 
 #include <windowsx.h>
 
 #include <limits>
 
@@ skipping 348 matching lines @@
               reinterpret_cast<LPARAM>(&keyboard_toolinfo));
   if (!tooltip_height_)
     tooltip_height_ = CalcTooltipHeight();
   RECT rect_bounds = {screen_point.x(),
                       screen_point.y() + focused_bounds.height(),
                       screen_point.x() + tooltip_width,
                       screen_point.y() + focused_bounds.height() +
                       line_count * tooltip_height_ };
   gfx::Rect monitor_bounds =
       views::GetMonitorBoundsForRect(gfx::Rect(rect_bounds));
-  rect_bounds = gfx::Rect(rect_bounds).AdjustToFit(monitor_bounds).ToRECT();
+  gfx::Rect fitted_bounds = gfx::Rect(rect_bounds);
+  fitted_bounds.AdjustToFit(monitor_bounds);
+  rect_bounds = fitted_bounds.ToRECT();
   ::SetWindowPos(keyboard_tooltip_hwnd_, NULL, rect_bounds.left,
                  rect_bounds.top, 0, 0,
                  SWP_NOZORDER | SWP_NOACTIVATE | SWP_NOSIZE);
   MessageLoop::current()->PostDelayedTask(
       FROM_HERE,
       base::Bind(&TooltipManagerWin::DestroyKeyboardTooltipWindow,
                  keyboard_tooltip_factory_.GetWeakPtr(),
                  keyboard_tooltip_hwnd_),
       base::TimeDelta::FromMilliseconds(kDefaultTimeout));
 }
 
 void TooltipManagerWin::HideKeyboardTooltip() {
   if (keyboard_tooltip_hwnd_ != NULL) {
     SendMessage(keyboard_tooltip_hwnd_, WM_CLOSE, 0, 0);
     keyboard_tooltip_hwnd_ = NULL;
   }
 }
 
 void TooltipManagerWin::DestroyKeyboardTooltipWindow(HWND window_to_destroy) {
   if (keyboard_tooltip_hwnd_ == window_to_destroy)
     HideKeyboardTooltip();
 }
 
 }  // namespace views