[Material][Mac] Reduced the area above tabs by 2 pts

chrome/browser/ui/cocoa/tabs/tab_window_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/tabs/tab_window_controller.h"
 
 #include "base/logging.h"
 #import "base/mac/sdk_forward_declarations.h"
 #import "chrome/browser/ui/cocoa/browser_window_layout.h"
 #import "chrome/browser/ui/cocoa/fast_resize_view.h"
@@ skipping 73 matching lines @@
         initWithFrame:NSMakeRect(0,
                                  NSMaxY([windowView bounds]) -
                                      kBrowserFrameViewPaintHeight,
                                  NSWidth([windowView bounds]),
                                  kBrowserFrameViewPaintHeight)]);
     [tabStripBackgroundView_
         setAutoresizingMask:NSViewWidthSizable | NSViewMinYMargin];
     [self insertTabStripBackgroundViewIntoWindow:window];
 
     tabStripView_.reset([[TabStripView alloc]
-        initWithFrame:NSMakeRect(
-                          0, 0, kDefaultWidth, chrome::kTabStripHeight)]);
+        initWithFrame:NSMakeRect(0, 0, kDefaultWidth,
+                                 chrome::TabStripHeight())]);
     [tabStripView_ setAutoresizingMask:NSViewWidthSizable |
                                        NSViewMinYMargin];
     if (hasTabStrip)
       [windowView addSubview:tabStripView_];
   }
   return self;
 }
 
 - (NSView*)tabStripBackgroundView {
   return tabStripBackgroundView_;
@@ skipping 277 matching lines @@
   [visualEffectView addSubview:tabStripBackgroundView_];
 }
 
 // Called when the size of the window content area has changed. Override to
 // position specific views. Base class implementation does nothing.
 - (void)layoutSubviews {
   NOTIMPLEMENTED();
 }
 
 @end