Add and use gfx::ScopedNSGraphicsContextState (ui/gfx/scoped_ns_graphics_context_state_mac.h).

chrome/browser/ui/cocoa/location_bar/instant_opt_in_view.mm

 // Copyright (c) 2010 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 <algorithm>
 
 #import "chrome/browser/ui/cocoa/location_bar/instant_opt_in_view.h"
 #import "third_party/GTM/AppKit/GTMNSBezierPath+RoundRect.h"
+#include "ui/gfx/scoped_ns_graphics_context_state_mac.h"
 
 namespace {
 // How to round off the popup's corners.  Goal is to match star and go
 // buttons.
 const CGFloat kPopupRoundingRadius = 3.5;
 
 // How far from the top of the view to place the horizontal line.
 const CGFloat kHorizontalLineTopOffset = 2;
 
 // How far from the sides to inset the horizontal line.
 const CGFloat kHorizontalLineInset = 2;
 }
 
 @implementation InstantOptInView
 
 - (void)drawRect:(NSRect)rect {
   // Round off the bottom corners only.
   NSBezierPath* path =
      [NSBezierPath gtm_bezierPathWithRoundRect:[self bounds]
                            topLeftCornerRadius:0
                           topRightCornerRadius:0
                         bottomLeftCornerRadius:kPopupRoundingRadius
                        bottomRightCornerRadius:kPopupRoundingRadius];
 
-  [NSGraphicsContext saveGraphicsState];
+  gfx::ScopedNSGraphicsContextState scopedGState;
   [path addClip];
 
   // Background is white.
   [[NSColor whiteColor] set];
   NSRectFill(rect);
 
   // Draw a horizontal line 2 px down from the top of the view, inset at the
   // sides by 2 px.
   CGFloat lineY = NSMaxY([self bounds]) - kHorizontalLineTopOffset;
   CGFloat minX = std::min(NSMinX([self bounds]) + kHorizontalLineInset,
                           NSMaxX([self bounds]));
   CGFloat maxX = std::max(NSMaxX([self bounds]) - kHorizontalLineInset,
                           NSMinX([self bounds]));
 
   [[NSColor lightGrayColor] set];
   NSRectFill(NSMakeRect(minX, lineY, maxX - minX, 1));
-
-  [NSGraphicsContext restoreGraphicsState];
 }
 
 @end