Do not show translate bar for MHTML files.

url/gurl.cc

 // Copyright 2013 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.
 
 #ifdef WIN32
 #include <windows.h>
 #else
 #include <pthread.h>
 #endif
 
@@ skipping 356 matching lines @@
                                            parsed_.scheme.len);
   return int_port;
 }
 
 std::string GURL::ExtractFileName() const {
   url_parse::Component file_component;
   url_parse::ExtractFileName(spec_.data(), parsed_.path, &file_component);
   return ComponentString(file_component);
 }
 
+std::string GURL::ExtractFileExtension() const {
+  url_parse::Component file_extension_component;
+  url_parse::ExtractFileExtension(spec_.data(), parsed_.path,
+                                  &file_extension_component);
+  return ComponentString(file_extension_component);
+}
+
 std::string GURL::PathForRequest() const {
   DCHECK(parsed_.path.len > 0) << "Canonical path for requests should be non-empty";
   if (parsed_.ref.len >= 0) {
     // Clip off the reference when it exists. The reference starts after the #
     // sign, so we have to subtract one to also remove it.
     return std::string(spec_, parsed_.path.begin,
                        parsed_.ref.begin - parsed_.path.begin - 1);
   }
   // Compute the actual path length, rather than depending on the spec's
   // terminator.  If we're an inner_url, our spec continues on into our outer
@@ skipping 108 matching lines @@
 void GURL::Swap(GURL* other) {
   spec_.swap(other->spec_);
   std::swap(is_valid_, other->is_valid_);
   std::swap(parsed_, other->parsed_);
   std::swap(inner_url_, other->inner_url_);
 }
 
 std::ostream& operator<<(std::ostream& out, const GURL& url) {
   return out << url.possibly_invalid_spec();
 }