[Mac][Material Design] Reduce distance between bookmark buttons.

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 237 matching lines @@
 - (void)resetAllButtonPositionsWithAnimation:(BOOL)animate;
 
 @end
 
 namespace bookmarks {
 
 CGFloat BookmarkHorizontalPadding() {
   if (!ui::MaterialDesignController::IsModeMaterial()) {
     return 1.0;
   }
-  return 16.0;
+  return 10.0;
 }
 
 CGFloat BookmarkVerticalPadding() {
   if (!ui::MaterialDesignController::IsModeMaterial()) {
     return 2.0;
   }
   return 4.0;
 }
 
 CGFloat BookmarkLeftMargin() {
@@ skipping 2818 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