Do not show translate bar for MHTML files.

url/url_parse.h

 // 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.
 
 #ifndef URL_URL_PARSE_H_
 #define URL_URL_PARSE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 314 matching lines @@
 // following the last slash.
 //
 // The 8-bit version requires UTF-8 encoding.
 URL_EXPORT void ExtractFileName(const char* url,
                                 const Component& path,
                                 Component* file_name);
 URL_EXPORT void ExtractFileName(const base::char16* url,
                                 const Component& path,
                                 Component* file_name);
 
+// Extracts the range of the file extension in the given url. It uses
+// ExtractFileName() to extract the file name first. The file extension is
+// defined all characters following the last dot in the file name, unless the
+// last dot is the first character of the file name.
+//
+// The file extension will be empty if the file name is empty or there is no
+// extension in the file name.
+URL_EXPORT void ExtractFileExtension(const char* url,
+                                     const Component& path,
+                                     Component* file_extension);
+URL_EXPORT void ExtractFileExtension(const base::char16* url,
+                                     const Component& path,
+                                     Component* file_extension);
+
 // Extract the first key/value from the range defined by |*query|. Updates
 // |*query| to start at the end of the extracted key/value pair. This is
 // designed for use in a loop: you can keep calling it with the same query
 // object and it will iterate over all items in the query.
 //
 // Some key/value pairs may have the key, the value, or both be empty (for
 // example, the query string "?&"). These will be returned. Note that an empty
 // last parameter "foo.com?" or foo.com?a&" will not be returned, this case
 // is the same as "done."
 //
 // The initial query component should not include the '?' (this is the default
 // for parsed URLs).
 //
 // If no key/value are found |*key| and |*value| will be unchanged and it will
 // return false.
 URL_EXPORT bool ExtractQueryKeyValue(const char* url,
                                      Component* query,
                                      Component* key,
                                      Component* value);
 URL_EXPORT bool ExtractQueryKeyValue(const base::char16* url,
                                      Component* query,
                                      Component* key,
                                      Component* value);
 
 }  // namespace url_parse
 
 #endif  // URL_URL_PARSE_H_