Fix scons build of gpu command buffer.

gpu/command_buffer/common/debug_marker_manager.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/common/debug_marker_manager.h"
 
 namespace gpu {
 namespace gles2 {
 
 DebugMarkerManager::Group::Group(const std::string& name)
     : name_(name),
       marker_(name) {
 }
 
 DebugMarkerManager::Group::~Group() {
 }
 
 void DebugMarkerManager::Group::SetMarker(const std::string& marker) {
   marker_ = name_ + "." + marker;
 }
 
 DebugMarkerManager::DebugMarkerManager() {
   // Push root group.
   group_stack_.push(Group(std::string("")));
-};
+}
 
 DebugMarkerManager::~DebugMarkerManager() {
 }
 
 void DebugMarkerManager::SetMarker(const std::string& marker) {
   group_stack_.top().SetMarker(marker);
 }
 
 const std::string& DebugMarkerManager::GetMarker() const {
   return group_stack_.top().marker();
 }
 
 void DebugMarkerManager::PushGroup(const std::string& name) {
   group_stack_.push(Group(group_stack_.top().name() + "." + name));
 }
 
 void DebugMarkerManager::PopGroup(void) {
   if (group_stack_.size() > 1) {
     group_stack_.pop();
   }
 }
 
 }  // namespace gles2
 }  // namespace gpu