mac: Prepare for -Wunused-functions.

gpu/command_buffer/client/gl_in_process_context.cc

 // Copyright (c) 2012 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 "gpu/command_buffer/client/gl_in_process_context.h"
 
 #include <set>
 #include <utility>
 #include <vector>
 
@@ skipping 73 matching lines @@
   base::Closure context_lost_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(GLInProcessContextImpl);
 };
 
 base::LazyInstance<base::Lock> g_all_shared_contexts_lock =
     LAZY_INSTANCE_INITIALIZER;
 base::LazyInstance<std::set<GLInProcessContextImpl*> > g_all_shared_contexts =
     LAZY_INSTANCE_INITIALIZER;
 
-size_t SharedContextCount() {
-  base::AutoLock lock(g_all_shared_contexts_lock.Get());
-  return g_all_shared_contexts.Get().size();
-}
-
 GLInProcessContextImpl::GLInProcessContextImpl()
     : share_group_id_(0), context_lost_(false) {}
 
 GLInProcessContextImpl::~GLInProcessContextImpl() {
   {
     base::AutoLock lock(g_all_shared_contexts_lock.Get());
     g_all_shared_contexts.Get().erase(this);
   }
   Destroy();
 }
@@ skipping 216 matching lines @@
       gfx::kNullAcceleratedWidget,
       surface->GetSize(),
       attribs,
       gpu_preference))
     return NULL;
 
   return context.release();
 }
 
 }  // namespace gpu