Change other usages of .size() to .empty() when applicable.

chrome/renderer/webgraphicscontext3d_command_buffer_impl.cc

 // Copyright (c) 2010 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.
 
 #if defined(ENABLE_GPU)
 
 #include "chrome/renderer/webgraphicscontext3d_command_buffer_impl.h"
 
 #include <GLES2/gl2.h>
 #ifndef GL_GLEXT_PROTOTYPES
@@ skipping 613 matching lines @@
 
 DELEGATE_TO_GL_3(getBufferParameteriv, GetBufferParameteriv,
                  WGC3Denum, WGC3Denum, WGC3Dint*)
 
 WebKit::WebGraphicsContext3D::Attributes
 WebGraphicsContext3DCommandBufferImpl::getContextAttributes() {
   return attributes_;
 }
 
 WGC3Denum WebGraphicsContext3DCommandBufferImpl::getError() {
-  if (synthetic_errors_.size() > 0) {
+  if (!synthetic_errors_.empty()) {
     std::vector<WGC3Denum>::iterator iter = synthetic_errors_.begin();
     WGC3Denum err = *iter;
     synthetic_errors_.erase(iter);
     return err;
   }
 
   makeContextCurrent();
   return glGetError();
 }
 
@@ skipping 369 matching lines @@
   context_lost_callback_ = cb;
 }
 
 void WebGraphicsContext3DCommandBufferImpl::OnContextLost() {
   if (context_lost_callback_) {
     context_lost_callback_->onContextLost();
   }
 }
 
 #endif  // defined(ENABLE_GPU)