Use the correct tabstrip height in maximized opaque frame windows in MD.

chrome/browser/ui/views/frame/opaque_browser_frame_view_layout.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/ui/views/frame/opaque_browser_frame_view_layout.h"
 
 #include "base/command_line.h"
 #include "build/build_config.h"
 #include "chrome/browser/profiles/profiles_state.h"
 #include "chrome/browser/ui/layout_constants.h"
@@ skipping 183 matching lines @@
 
 int OpaqueBrowserFrameViewLayout::NonClientTopBorderHeight(
     bool restored) const {
   if (delegate_->ShouldShowWindowTitle()) {
     return std::max(FrameBorderThickness(restored) + delegate_->GetIconSize(),
                     CaptionButtonY(restored) + kCaptionButtonHeight) +
         TitlebarBottomThickness(restored);
   }
 
   int thickness = FrameBorderThickness(restored);
+  // The tab top inset is equal to the height of any shadow region above the
+  // tabs, plus a 1 px top stroke.  In maximized mode, we want to push the
+  // shadow region off the top of the screen but leave the top stroke.
   if (!restored && delegate_->IsTabStripVisible() && IsTitleBarCondensed())
-    thickness -= kTabstripTopShadowThickness;
+    thickness -= GetLayoutInsets(TAB).top() - 1;
   return thickness;
 }
 
 int OpaqueBrowserFrameViewLayout::GetTabStripInsetsTop(bool restored) const {
   const int top = NonClientTopBorderHeight(restored);
   // Annoyingly, the pre-MD layout uses different heights for the hit-test
   // exclusion region (which we want here, since we're trying to size the border
   // so that the region above the tab's hit-test zone matches) versus the shadow
   // thickness.
   const int exclusion = GetLayoutConstant(TAB_TOP_EXCLUSION_HEIGHT);
@@ skipping 445 matching lines @@
 
 void OpaqueBrowserFrameViewLayout::ViewAdded(views::View* host,
                                              views::View* view) {
   SetView(view->id(), view);
 }
 
 void OpaqueBrowserFrameViewLayout::ViewRemoved(views::View* host,
                                                views::View* view) {
   SetView(view->id(), nullptr);
 }