Fix bug in binary_size script and cosmetic updates

tools/binary_size/run_binary_size_analysis.py

 #!/usr/bin/python
 # Copyright 2014 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.
 
 """Generate a spatial analysis against an arbitrary library.
 
 To use, build the 'binary_size_tool' target. Then run this tool, passing
 in the location of the library to be analyzed along with any other options
 you desire.
@@ skipping 458 matching lines @@
                        os.path.join(opts.destdir, 'largest-symbols.js'), 100)
   DumpLargestSources(symbols,
                        os.path.join(opts.destdir, 'largest-sources.js'), 100)
   DumpLargestVTables(symbols,
                        os.path.join(opts.destdir, 'largest-vtables.js'), 100)
 
   # TODO(andrewhayden): Switch to D3 for greater flexibility
   treemap_out = os.path.join(opts.destdir, 'webtreemap')
   if not os.path.exists(treemap_out):
     os.makedirs(treemap_out, 0755)
-  treemap_src = os.path.join('third_party', 'webtreemap', 'src',
-                             'webtreemap-gh-pages')
+  treemap_src = os.path.join('third_party', 'webtreemap', 'src')
   shutil.copy(os.path.join(treemap_src, 'COPYING'), treemap_out)
   shutil.copy(os.path.join(treemap_src, 'webtreemap.js'), treemap_out)
   shutil.copy(os.path.join(treemap_src, 'webtreemap.css'), treemap_out)
   shutil.copy(os.path.join('tools', 'binary_size', 'template', 'index.html'),
               opts.destdir)
   if opts.verbose:
     print 'Report saved to ' + opts.destdir + '/index.html'
 
 
 if __name__ == '__main__':
   sys.exit(main())