[Mac] Restore the old bookmark menus now that the experiment is over.

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