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

ash/wm/workspace/workspace_layout_manager2.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/workspace/workspace_layout_manager2.h"
 
 #include "ash/ash_switches.h"
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
 #include "ash/wm/always_on_top_controller.h"
@@ skipping 271 matching lines @@
 }
 
 void WorkspaceLayoutManager2::AdjustWindowSizeForScreenChange(
     Window* window,
     AdjustWindowReason reason) {
   if (GetTrackedByWorkspace(window) &&
       !SetMaximizedOrFullscreenBounds(window)) {
     if (reason == ADJUST_WINDOW_SCREEN_SIZE_CHANGED) {
       // The work area may be smaller than the full screen.  Put as much of the
       // window as possible within the display area.
-      window->SetBounds(window->bounds().AdjustToFit(work_area_));
+      gfx::Rect bounds = window->bounds();
+      bounds.AdjustToFit(work_area_);
+      window->SetBounds(bounds);
     } else if (reason == ADJUST_WINDOW_DISPLAY_INSETS_CHANGED) {
       // If the window is completely outside the display work area, then move it
       // enough to be visible again.
       gfx::Rect bounds = window->bounds();
       if (!work_area_.Intersects(bounds)) {
         int y_offset = 0;
         if (work_area_.bottom() < bounds.y()) {
           y_offset = work_area_.bottom() - bounds.y() - kMinimumOnScreenArea;
         } else if (bounds.bottom() < work_area_.y()) {
           y_offset = work_area_.y() - bounds.bottom() + kMinimumOnScreenArea;
@@ skipping 66 matching lines @@
   }
   return false;
 }
 
 WorkspaceManager2* WorkspaceLayoutManager2::workspace_manager() {
   return workspace_->workspace_manager();
 }
 
 }  // namespace internal
 }  // namespace ash