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

ash/tooltips/tooltip_controller.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/tooltips/tooltip_controller.h"
 
 #include <vector>
 
 #include "ash/ash_switches.h"
 #include "ash/shell.h"
@@ skipping 161 matching lines @@
     if (tooltip_rect.right() > display_bounds.right()) {
       int h_offset = tooltip_rect.right() - display_bounds.right();
       tooltip_rect.Offset(-h_offset, 0);
     }
 
     // If tooltip is out of bounds on the y axis, we flip it to appear above the
     // mouse cursor instead of below.
     if (tooltip_rect.bottom() > display_bounds.bottom())
       tooltip_rect.set_y(mouse_pos.y() - tooltip_height);
 
-    GetWidget()->SetBounds(tooltip_rect.AdjustToFit(display_bounds));
+    tooltip_rect.AdjustToFit(display_bounds);
+    GetWidget()->SetBounds(tooltip_rect);
   }
 
   views::Widget* GetWidget() {
     if (!widget_) {
       widget_ = CreateTooltip();
       widget_->SetContentsView(&label_);
       widget_->AddObserver(this);
     }
     return widget_;
   }
@@ skipping 277 matching lines @@
 }
 
 TooltipController::Tooltip* TooltipController::GetTooltip() {
   if (!tooltip_.get())
     tooltip_.reset(new Tooltip);
   return tooltip_.get();
 }
 
 }  // namespace internal
 }  // namespace ash