Fix swap ack to always be echo on aura

Regressed here: https://chromiumcodereview.appspot.com/11341033/
Previous attempt here: http://codereview.chromium.org/11363018/

R=kbr@chromium.org


Review URL: https://chromiumcodereview.appspot.com/11312071

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@165782 0039d316-1c4b-4281-b951-d872f2087c98

content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc

@@ -149,7 +149,7 @@ WebGraphicsContext3DCommandBufferImpl::WebGraphicsContext3DCommandBufferImpl(
       frame_number_(0),
       bind_generates_resources_(false),
       use_echo_for_swap_ack_(true) {
-#if defined(OS_MACOSX) || defined(OS_WIN)
+#if (defined(OS_MACOSX) || defined(OS_WIN)) && !defined(USE_AURA)
   // Get ViewMsg_SwapBuffers_ACK from browser for single-threaded path.
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   use_echo_for_swap_ack_ =