[Mac] Replace the custom bookmark menus with native NSMenus.

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

-// 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.
-
-#import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_window.h"
-
-#import "base/logging.h"
-#import "base/memory/scoped_nsobject.h"
-#import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_constants.h"
-#import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_controller.h"
-#import "chrome/browser/ui/cocoa/image_utils.h"
-#import "third_party/GTM/AppKit/GTMNSColor+Luminance.h"
-#import "third_party/GTM/AppKit/GTMNSBezierPath+RoundRect.h"
-
-using bookmarks::kBookmarkBarMenuCornerRadius;
-
-@implementation BookmarkBarFolderWindow
-
-- (id)initWithContentRect:(NSRect)contentRect
-                styleMask:(NSUInteger)windowStyle
-                  backing:(NSBackingStoreType)bufferingType
-                    defer:(BOOL)deferCreation {
-  if ((self = [super initWithContentRect:contentRect
-                               styleMask:NSBorderlessWindowMask // override
-                                 backing:bufferingType
-                                   defer:deferCreation])) {
-    [self setBackgroundColor:[NSColor clearColor]];
-    [self setOpaque:NO];
-  }
-  return self;
-}
-
-- (BOOL)canBecomeKeyWindow {
-  return YES;
-}
-
-- (BOOL)canBecomeMainWindow {
-  return NO;
-}
-
-// Override of keyDown as the NSWindow default implementation beeps.
-- (void)keyDown:(NSEvent *)theEvent {
-}
-
-@end
-
-
-@implementation BookmarkBarFolderWindowContentView
-
-- (void)drawRect:(NSRect)rect {
-  // Like NSMenus, only the bottom corners are rounded.
-  NSBezierPath* bezier =
-      [NSBezierPath gtm_bezierPathWithRoundRect:[self bounds]
-                            topLeftCornerRadius:kBookmarkBarMenuCornerRadius
-                           topRightCornerRadius:kBookmarkBarMenuCornerRadius
-                         bottomLeftCornerRadius:kBookmarkBarMenuCornerRadius
-                        bottomRightCornerRadius:kBookmarkBarMenuCornerRadius];
-  NSColor* startColor = [NSColor colorWithCalibratedWhite:0.91 alpha:1.0];
-  NSColor* midColor =
-      [startColor gtm_colorAdjustedFor:GTMColorationLightMidtone faded:YES];
-  NSColor* endColor =
-      [startColor gtm_colorAdjustedFor:GTMColorationLightPenumbra faded:YES];
-
-  scoped_nsobject<NSGradient> gradient(
-    [[NSGradient alloc] initWithColorsAndLocations:startColor, 0.0,
-                        midColor, 0.25,
-                        endColor, 0.5,
-                        midColor, 0.75,
-                        startColor, 1.0,
-                        nil]);
-  [gradient drawInBezierPath:bezier angle:0.0];
-}
-
-@end
-
-
-@implementation BookmarkBarFolderWindowScrollView
-
-// We want "draw background" of the NSScrollView in the xib to be NOT
-// checked.  That allows us to round the bottom corners of the folder
-// window.  However that also allows some scrollWheel: events to leak
-// into the NSWindow behind it (even in a different application).
-// Better to plug the scroll leak than to round corners for M5.
-- (void)scrollWheel:(NSEvent *)theEvent {
-  DCHECK([[[self window] windowController]
-           respondsToSelector:@selector(scrollWheel:)]);
-  [[[self window] windowController] scrollWheel:theEvent];
-}
-
-@end