mac: Prepare for -Wunused-functions.

content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.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 "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
 
 #include "third_party/khronos/GLES2/gl2.h"
 #ifndef GL_GLEXT_PROTOTYPES
 #define GL_GLEXT_PROTOTYPES 1
 #endif
@@ skipping 32 matching lines @@
 namespace {
 
 static base::LazyInstance<base::Lock>::Leaky
     g_all_shared_contexts_lock = LAZY_INSTANCE_INITIALIZER;
 
 typedef std::multimap<GpuChannelHost*, WebGraphicsContext3DCommandBufferImpl*>
     ContextMap;
 static base::LazyInstance<ContextMap> g_all_shared_contexts =
     LAZY_INSTANCE_INITIALIZER;
 
-size_t ClampUint64ToSizeT(uint64 value) {
-  value = std::min(value,
-                   static_cast<uint64>(std::numeric_limits<size_t>::max()));
-  return static_cast<size_t>(value);
-}
-
 uint32_t GenFlushID() {
   static base::subtle::Atomic32 flush_id = 0;
 
   base::subtle::Atomic32 my_id = base::subtle::Barrier_AtomicIncrement(
       &flush_id, 1);
   return static_cast<uint32_t>(my_id);
 }
 
 // Singleton used to initialize and terminate the gles2 library.
 class GLES2Initializer {
@@ skipping 1389 matching lines @@
 
 void WebGraphicsContext3DCommandBufferImpl::OnErrorMessage(
     const std::string& message, int id) {
   if (error_message_callback_) {
     blink::WebString str = blink::WebString::fromUTF8(message.c_str());
     error_message_callback_->onErrorMessage(str, id);
   }
 }
 
 }  // namespace content