Start using allowed C++11 features.

samples/image_diff.cc

 // Copyright (c) 2011 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.
 
 // This file input format is based loosely on
 // Tools/DumpRenderTree/ImageDiff.m
 
 // The exact format of this tool's output to stdout is important, to match
 // what the run-webkit-tests script expects.
 
@@ skipping 62 matching lines @@
     std::vector<unsigned char> compressed;
     const size_t kBufSize = 1024;
     unsigned char buf[kBufSize];
     size_t num_read = 0;
     while ((num_read = fread(buf, 1, kBufSize, f)) > 0) {
       compressed.insert(compressed.end(), buf, buf + num_read);
     }
 
     fclose(f);
 
-    if (!image_diff_png::DecodePNG(&compressed[0], compressed.size(),
-                                   &data_, &w_, &h_)) {
+    if (!image_diff_png::DecodePNG(compressed.data(), compressed.size(), &data_,
+                                   &w_, &h_)) {
       Clear();
       return false;
     }
     return true;
   }
 
   void Clear() {
     w_ = h_ = 0;
     data_.clear();
   }
@@ skipping 248 matching lines @@
     if (!diff_filename.empty()) {
       return DiffImages(filename1, filename2, diff_filename);
     }
   } else if (!filename2.empty()) {
     return CompareImages(filename1, filename2, histograms);
   }
 
   PrintHelp();
   return kStatusError;
 }