Update to Chromium revision 304f01a1 (#358063)

- Improve ordering of CefLoadHandler callbacks. OnLoadingStateChange will
  be called before and after all calls to OnLoadStart and OnLoadEnd.
  OnLoadStart/OnLoadEnd calls will occur as matching pairs
  (see http://crbug.com/539952#c2).
- Remove the |requesting_url| argument to CefGeolocationHandler::
  OnCancelGeolocationPermission. Clients can use the |request_id| argument
  to track this information themselves.
- Fix a crash when loading the PDF extension in multiple browsers with a
  custom CefRequestContext (issue #1757).

patch/patches/gyp_331.patch

@@ -1,8 +1,8 @@
 diff --git gyp/generator/ninja.py gyp/generator/ninja.py
-index 51c288b..d996bbd 100644
+index 58be3bf..4dcb2a6 100644
 --- gyp/generator/ninja.py
 +++ gyp/generator/ninja.py
-@@ -741,7 +741,16 @@ class NinjaWriter(object):
+@@ -745,7 +745,16 @@ class NinjaWriter(object):
        for path in copy['files']:
          # Normalize the path so trailing slashes don't confuse us.
          path = os.path.normpath(path)