[Mac] Give info bubble windows a gaussian blur and a smaller border radius.

chrome/browser/ui/cocoa/info_bubble_view.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_INFO_BUBBLE_VIEW_H_
 #define CHROME_BROWSER_UI_COCOA_INFO_BUBBLE_VIEW_H_
 #pragma once
 
 #import <Cocoa/Cocoa.h>
 
 namespace info_bubble {
 
 const CGFloat kBubbleArrowHeight = 8.0;
 const CGFloat kBubbleArrowWidth = 15.0;
-const CGFloat kBubbleCornerRadius = 8.0;
+const CGFloat kBubbleCornerRadius = 2.0;
 const CGFloat kBubbleArrowXOffset = kBubbleArrowWidth + kBubbleCornerRadius;
 
 enum BubbleArrowLocation {
   kTopLeft,
   kTopRight,
   kNoArrow,
 };
 
 enum BubbleAlignment {
   // The tip of the arrow points to the anchor point.
@@ skipping 14 matching lines @@
 
 @property(assign, nonatomic) info_bubble::BubbleArrowLocation arrowLocation;
 @property(assign, nonatomic) info_bubble::BubbleAlignment alignment;
 
 // Returns the point location in view coordinates of the tip of the arrow.
 - (NSPoint)arrowTip;
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_INFO_BUBBLE_VIEW_H_