[Mac][Material Design] Fix indentation of first and last bookmark items.

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

 // Copyright (c) 2012 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_controller.h"
 
 #include <stddef.h>
 
 #import "base/mac/bundle_locations.h"
 #import "base/mac/foundation_util.h"
@@ skipping 251 matching lines @@
   if (!ui::MaterialDesignController::IsModeMaterial()) {
     return 2.0;
   }
   return 4.0;
 }
 
 CGFloat BookmarkLeftMargin() {
   if (!ui::MaterialDesignController::IsModeMaterial()) {
     return 2.0;
   }
-  return 12.0;
+  return 8.0;
 }
 
 CGFloat BookmarkRightMargin() {
   if (!ui::MaterialDesignController::IsModeMaterial()) {
     return 2.0;
   }
-  return 12.0;
+  return 8.0;
 }
 
 }  // namespace bookmarks
 
 @implementation BookmarkBarController
 
 @synthesize currentState = currentState_;
 @synthesize lastState = lastState_;
 @synthesize isAnimationRunning = isAnimationRunning_;
 @synthesize delegate = delegate_;
@@ skipping 2795 matching lines @@
 - (id<BookmarkButtonControllerProtocol>)controllerForNode:
     (const BookmarkNode*)node {
   // See if it's in the bar, then if it is in the hierarchy of visible
   // folder menus.
   if (bookmarkModel_->bookmark_bar_node() == node)
     return self;
   return [folderController_ controllerForNode:node];
 }
 
 @end