Fix a few lints found while working on crrev.com/1051503003.

gpu/command_buffer/client/gles2_implementation.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.
 
 // A class to emulate GLES2 over command buffers.
 
 #include "gpu/command_buffer/client/gles2_implementation.h"
 
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
@@ skipping 2403 matching lines @@
                                      GetResultShmId(), GetResultShmOffset());
   WaitForCmd();
   if (*result) {
     if (bufsize == 0) {
       if (length) {
         *length = 0;
       }
     } else if (length || name) {
       std::vector<int8> str;
       GetBucketContents(kResultBucketId, &str);
-      DCHECK(str.size() > 0);
+      DCHECK_GT(str.size(), 0u);
       GLsizei max_size =
           std::min(bufsize, static_cast<GLsizei>(str.size())) - 1;
       if (length) {
         *length = max_size;
       }
       if (name) {
         memcpy(name, &str[0], max_size);
         name[max_size] = '\0';
       }
     }
@@ skipping 2692 matching lines @@
   CheckGLError();
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/client/gles2_implementation_impl_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu