Update to Chromium revision cb947c01 (#352221)

- Implement CefRequestHandler::OnBeforeBrowse using NavigationThrottle
  instead of ResourceThrottle (see http://crbug.com/537634). The CefRequest
  object passed to OnBeforeBrowse will no longer have an associated request
  identifier.
- Mac: Remove additional helper apps which are no longer required (see
  http://crbug.com/520680)
- Remove the UR_FLAG_REPORT_RAW_HEADERS flag which is no longer supported (see
  http://crbug.com/517114)
- Remove the CefBrowserSettings.java parameter. Java is an NPAPI plugin and
  NPAPI plugins are no longer supported (see http://crbug.com/470301#c11)
- Add CefFormatUrlForSecurityDisplay function in cef_parser.h
- Fix crash when passing `--disable-extensions` command-line flag (issue #1721)
- Linux: Fix NSS handler loading (issue #1727)

libcef/browser/internal_scheme_handler.cc

@@ -33,9 +33,16 @@ static std::string GetMimeType(const std::string& filename) {
   base::ThreadRestrictions::ScopedAllowIO allow_io;
 
   std::string mime_type;
-  if (net::GetMimeTypeFromFile(FilePathFromASCII(filename), &mime_type))
+  const base::FilePath& file_path = FilePathFromASCII(filename);
+  if (net::GetMimeTypeFromFile(file_path, &mime_type))
     return mime_type;
 
+  // Check for newer extensions used by internal resources but not yet
+  // recognized by the mime type detector.
+  const std::string& extension = CefString(file_path.FinalExtension());
+  if (extension == ".woff2")
+    return "application/font-woff2";
+
   NOTREACHED() << "No known mime type for file: " << filename.c_str();
   return "text/plain";
 }