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

content/browser/compositor/gpu_process_transport_factory.cc

 // Copyright 2014 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 "content/browser/compositor/gpu_process_transport_factory.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 156 matching lines @@
     ui::Compositor* compositor) {
 #if defined(OS_WIN)
   return scoped_ptr<cc::SoftwareOutputDevice>(new SoftwareOutputDeviceWin(
       compositor));
 #elif defined(USE_OZONE)
   return scoped_ptr<cc::SoftwareOutputDevice>(new SoftwareOutputDeviceOzone(
       compositor));
 #elif defined(USE_X11)
   return scoped_ptr<cc::SoftwareOutputDevice>(new SoftwareOutputDeviceX11(
       compositor));
-#endif
-
+#else
   NOTREACHED();
   return scoped_ptr<cc::SoftwareOutputDevice>();
+#endif
 }
 
 scoped_ptr<cc::OutputSurface> GpuProcessTransportFactory::CreateOutputSurface(
     ui::Compositor* compositor, bool software_fallback) {
   PerCompositorData* data = per_compositor_data_[compositor];
   if (!data)
     data = CreatePerCompositorData(compositor);
 
   bool create_software_renderer = software_fallback;
 #if defined(OS_CHROMEOS)
@@ skipping 285 matching lines @@
                     observer_list_,
                     OnLostResources());
 
   // Kill things that use the shared context before killing the shared context.
   lost_gl_helper.reset();
   lost_offscreen_compositor_contexts = NULL;
   lost_shared_main_thread_contexts  = NULL;
 }
 
 }  // namespace content