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

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_toolbar_view.mm

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_bar_toolbar_view.mm
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_toolbar_view.mm b/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_toolbar_view.mm
index 1060e590d2dab876b05844d87e9f5d6eeab167bf..8ae613de662720bea51cac2128a2f5d9c88fdca9 100644
--- a/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_toolbar_view.mm
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_toolbar_view.mm
@@ -13,6 +13,7 @@
 #include "ui/base/theme_provider.h"
 #include "ui/gfx/canvas_skia_paint.h"
 #include "ui/gfx/rect.h"
+#include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
 
 const CGFloat kBorderRadius = 3.0;
 
@@ -56,7 +57,7 @@ const CGFloat kBorderRadius = 3.0;
     return;
 
   NSGraphicsContext* context = [NSGraphicsContext currentContext];
-  [context saveGraphicsState];
+  gfx::ScopedNSGraphicsContextSaveGState scopedGState(context);
 
   // Draw the background.
   {
@@ -101,15 +102,16 @@ const CGFloat kBorderRadius = 3.0;
   [border fill];
 
   // Fade in/out the background.
-  [context saveGraphicsState];
-  [border setClip];
-  CGContextRef cgContext = (CGContextRef)[context graphicsPort];
-  CGContextBeginTransparencyLayer(cgContext, NULL);
-  CGContextSetAlpha(cgContext, 1 - morph);
-  [context setPatternPhase:[[self window] themePatternPhase]];
-  [self drawBackground];
-  CGContextEndTransparencyLayer(cgContext);
-  [context restoreGraphicsState];
+  {
+    gfx::ScopedNSGraphicsContextSaveGState bgScopedState(context);
+    [border setClip];
+    CGContextRef cgContext = (CGContextRef)[context graphicsPort];
+    CGContextBeginTransparencyLayer(cgContext, NULL);
+    CGContextSetAlpha(cgContext, 1 - morph);
+    [context setPatternPhase:[[self window] themePatternPhase]];
+    [self drawBackground];
+    CGContextEndTransparencyLayer(cgContext);
+  }
 
   // Draw the border of the rounded rectangle.
   NSColor* borderColor = themeProvider->GetNSColor(
@@ -133,9 +135,6 @@ const CGFloat kBorderRadius = 3.0;
   [divider moveToPoint:dividerStart];
   [divider relativeLineToPoint:NSMakePoint(dividerWidth, 0)];
   [divider stroke];
-
-  // Restore the graphics context.
-  [context restoreGraphicsState];
 }
 
 @end  // @implementation BookmarkBarToolbarView