Fix "unreachable code" warnings (MSVC warning 4702) in chrome/browser/.

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 "chrome/browser/profiles/profiles_state.h"
 #include "chrome/browser/ui/views/avatar_label.h"
 #include "chrome/browser/ui/views/avatar_menu_button.h"
@@ skipping 114 matching lines @@
   trailing_buttons_.push_back(views::FRAME_BUTTON_MAXIMIZE);
   trailing_buttons_.push_back(views::FRAME_BUTTON_CLOSE);
 }
 
 OpaqueBrowserFrameViewLayout::~OpaqueBrowserFrameViewLayout() {}
 
 // static
 bool OpaqueBrowserFrameViewLayout::ShouldAddDefaultCaptionButtons() {
 #if defined(OS_WIN)
   return !win8::IsSingleWindowMetroMode();
-#endif  // OS_WIN
+#else
   return true;
+#endif
 }
 
 void OpaqueBrowserFrameViewLayout::SetButtonOrdering(
     const std::vector<views::FrameButton>& leading_buttons,
     const std::vector<views::FrameButton>& trailing_buttons) {
   leading_buttons_ = leading_buttons;
   trailing_buttons_ = trailing_buttons;
 }
 
 gfx::Rect OpaqueBrowserFrameViewLayout::GetBoundsForTabStrip(
@@ skipping 553 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(), NULL);
 }