cocoa browser: remove non-MD bookmark bar support

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/mac/scoped_nsobject.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_constants.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_controller.h"
@@ skipping 50 matching lines @@
 - (NSString*)accessibilityTitle {
   return l10n_util::GetNSString(IDS_ACCNAME_BOOKMARKS_MENU);
 }
 
 @end
 
 
 @implementation BookmarkBarFolderWindowContentView
 
 + (NSColor*)backgroundColor {
-  DCHECK(ui::MaterialDesignController::IsModeMaterial());
   static NSColor* backgroundColor =
       [[NSColor colorWithGenericGamma22White:kMDFolderWindowBackgroundColor
                                        alpha:1.0] retain];
   return backgroundColor;
 }
 
 - (void)drawRect:(NSRect)rect {
   // Like NSMenus, only the bottom corners are rounded.
   NSBezierPath* bezier =
       [NSBezierPath bezierPathWithRoundedRect:[self bounds]
                                       xRadius:kBookmarkBarMenuCornerRadius
                                       yRadius:kBookmarkBarMenuCornerRadius];
-  if (ui::MaterialDesignController::IsModeMaterial()) {
-    [[BookmarkBarFolderWindowContentView backgroundColor] set];
-    [bezier fill];
-  } else {
-    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];
-
-    base::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];
-  }
+  [[BookmarkBarFolderWindowContentView backgroundColor] set];
+  [bezier fill];
 }
 
 @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