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

ui/gfx/animation/animation.cc

 // Copyright (c) 2011 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 "ui/gfx/animation/animation.h"
 
 #include "ui/gfx/animation/animation_container.h"
 #include "ui/gfx/animation/animation_delegate.h"
 #include "ui/gfx/animation/tween.h"
 #include "ui/gfx/rect.h"
@@ skipping 88 matching lines @@
     // Get "Turn off all unnecessary animations" value.
     if (::SystemParametersInfo(SPI_GETCLIENTAREAANIMATION, 0, &result, 0)) {
       // There seems to be a typo in the MSDN document (as of May 2009):
       //   http://msdn.microsoft.com/en-us/library/ms724947(VS.85).aspx
       // The document states that the result is TRUE when animations are
       // _disabled_, but in fact, it is TRUE when they are _enabled_.
       return !!result;
     }
   }
   return !::GetSystemMetrics(SM_REMOTESESSION);
+#else
+  return true;
 #endif
-  return true;
 }
 
 bool Animation::ShouldSendCanceledFromStop() {
   return false;
 }
 
 void Animation::SetStartTime(base::TimeTicks start_time) {
   start_time_ = start_time;
 }
 
 base::TimeDelta Animation::GetTimerInterval() const {
   return timer_interval_;
 }
 
 }  // namespace gfx