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

ui/base/win/hwnd_util.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/base/win/hwnd_util.h"
 
 #include "base/i18n/rtl.h"
 #include "base/string_util.h"
 #include "base/win/metro.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
 namespace ui {
 
 namespace {
 
 // Adjust the window to fit.
 void AdjustWindowToFit(HWND hwnd, const RECT& bounds, bool fit_to_monitor) {
   if (fit_to_monitor) {
     // Get the monitor.
     HMONITOR hmon = MonitorFromRect(&bounds, MONITOR_DEFAULTTONEAREST);
     if (hmon) {
       MONITORINFO mi;
       mi.cbSize = sizeof(mi);
       GetMonitorInfo(hmon, &mi);
       gfx::Rect window_rect(bounds);
       gfx::Rect monitor_rect(mi.rcWork);
-      gfx::Rect new_window_rect = window_rect.AdjustToFit(monitor_rect);
+      gfx::Rect new_window_rect = window_rect;
+      new_window_rect.AdjustToFit(monitor_rect);
       if (new_window_rect != window_rect) {
         // Window doesn't fit on monitor, move and possibly resize.
         SetWindowPos(hwnd, 0, new_window_rect.x(), new_window_rect.y(),
                      new_window_rect.width(), new_window_rect.height(),
                      SWP_NOACTIVATE | SWP_NOZORDER);
         return;
       }
       // Else fall through.
     } else {
       NOTREACHED() << "Unable to find default monitor";
@@ skipping 154 matching lines @@
   HMODULE metro = base::win::GetMetroModule();
   if (!metro)
     return get_real_hwnd ? ::GetDesktopWindow() : HWND_DESKTOP;
   // In windows 8 metro-mode the root window is not the desktop.
   RootWindow root_window =
       reinterpret_cast<RootWindow>(::GetProcAddress(metro, "GetRootWindow"));
   return root_window();
 }
 
 }  // namespace ui