Use ' instead of " when rewriting -webkit-image-set.

grit/gather/chrome_html.py

 #!/usr/bin/env python
 # 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.
 
 """Prepares a Chrome HTML file by inlining resources and adding references to
 high DPI resources and removing references to unsupported scale factors.
 
 This is a small gatherer that takes a HTML file, looks for src attributes
 and inlines the specified file, producing one HTML file with no external
@@ skipping 55 matching lines @@
   Returns:
     string
   """
   filename = src_match.group('filename')
   attr = src_match.group('attribute')
   prefix = src_match.string[src_match.start():src_match.start('filename')-1]
 
   # Any matches for which a chrome URL handler will serve all scale factors
   # can simply request all scale factors.
   if _THEME_SOURCE.match(filename):
-    images = ["url(\"%s\") %s" % (filename, '1x')]
+    images = ["url('%s') %s" % (filename, '1x')]
     for sc in scale_factors:
-      images.append("url(\"%s@%s\") %s" % (filename, sc, sc))
+      images.append("url('%s@%s') %s" % (filename, sc, sc))
     return "%s: -webkit-image-set(%s" % (attr, ', '.join(images))
 
   if filename.find(':') != -1:
     # filename is probably a URL, which we don't want to bother inlining
     return src_match.group(0)
 
   filename = filename.replace(DIST_SUBSTR, distribution)
   filepath = os.path.join(base_path, filename)
-  images = ["url(\"%s\") %s" % (filename, '1x')]
+  images = ["url('%s') %s" % (filename, '1x')]
 
   for sc in scale_factors:
     # Check for existence of file and add to image set.
     scale_path = os.path.split(os.path.join(base_path, filename))
     scale_image_path = os.path.join(scale_path[0], sc, scale_path[1])
     if os.path.isfile(scale_image_path):
       # CSS always uses forward slashed paths.
       scale_image_name = re.sub('(?P<path>(.*/)?)(?P<file>[^/]*)',
                                 '\\g<path>' + sc + '/\\g<file>',
                                 filename)
-      images.append("url(\"%s\") %s" % (scale_image_name, sc))
+      images.append("url('%s') %s" % (scale_image_name, sc))
   return "%s: -webkit-image-set(%s" % (attr, ', '.join(images))
 
 
 def InsertImageSets(
     filepath, text, scale_factors, distribution):
   """Helper function that adds references to external images available in any of
   scale_factors in CSS backgrounds.
   """
   # Add high DPI urls for css attributes: content, background,
   # or *-image.
@@ skipping 113 matching lines @@
           allow_external_script = self.allow_external_script_,
           rewrite_function=lambda fp, t, d: ProcessImageSets(
               fp, t, self.scale_factors_, d))
     else:
       distribution = html_inline.GetDistribution()
       self.inlined_text_ = ProcessImageSets(
           os.path.dirname(filename),
           util.ReadFile(filename, 'utf-8'),
           self.scale_factors_,
           distribution)