Rename CommandLine::GetArgs(), update callers.

tools/imagediff/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 348 matching lines @@
         filename1 = FilePath();
       } else {
         // Save the first filename in another buffer and wait for the second
         // filename to arrive via stdin.
         filename1 = FilePathFromASCII(stdin_buffer);
       }
     }
     return 0;
   }
 
-  const std::vector<CommandLine::StringType>& args = parsed_command_line.args();
+  const CommandLine::StringVector& args = parsed_command_line.GetArgs();
   if (parsed_command_line.HasSwitch(kOptionGenerateDiff)) {
     if (args.size() == 3) {
       return DiffImages(FilePath(args[0]),
                         FilePath(args[1]),
                         FilePath(args[2]));
     }
   } else if (args.size() == 2) {
     return CompareImages(FilePath(args[0]), FilePath(args[1]));
   }
 
   PrintHelp();
   return kStatusError;
 }