Do not show translate bar for MHTML files.

url/url_parse_unittest.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.
 
 #include "url/url_parse.h"
 
 #include "base/basictypes.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/url_parse.h"
 
@@ skipping 441 matching lines @@
     url_parse::Parsed parsed;
     url_parse::ParseStandardURL(url, len, &parsed);
 
     url_parse::Component file_name;
     url_parse::ExtractFileName(url, parsed.path, &file_name);
 
     EXPECT_TRUE(ComponentMatches(url, file_cases[i].expected, file_name));
   }
 }
 
+TEST(URLParser, ExtractFileExtension) {
+  struct FileCase {
+    const char* input;
+    const char* expected;
+  } file_cases[] = {
+    {"http://www.google.com", NULL},
+    {"http://www.google.com/", NULL},
+    {"http://www.google.com/.foo", NULL},
+    {"http://www.google.com/foo.bar", "bar"},
+    {"http://www.google.com/foo.", ""},
+    {"http://www.google.com/.foo.bar", "bar"},
+    {"http://www.google.com/a.b.c", "c"},
+  };
+
+  for (size_t i = 0; i < ARRAYSIZE(file_cases); i++) {
+    const char* url = file_cases[i].input;
+    int len = static_cast<int>(strlen(url));
+
+    url_parse::Parsed parsed;
+    url_parse::ParseStandardURL(url, len, &parsed);
+
+    url_parse::Component file_name;
+    url_parse::ExtractFileExtension(url, parsed.path, &file_name);
+
+    EXPECT_TRUE(ComponentMatches(url, file_cases[i].expected, file_name));
+  }
+}
+
 // Returns true if the parameter with index |parameter| in the given URL's
 // query string. The expected key can be NULL to indicate no such key index
 // should exist. The parameter number is 1-based.
 static bool NthParameterIs(const char* url,
                            int parameter,
                            const char* expected_key,
                            const char* expected_value) {
   url_parse::Parsed parsed;
   url_parse::ParseStandardURL(url, static_cast<int>(strlen(url)), &parsed);
 
@@ skipping 145 matching lines @@
     // The remaining components are never used for filesystem urls.
     ExpectInvalidComponent(parsed.username);
     ExpectInvalidComponent(parsed.password);
     ExpectInvalidComponent(parsed.host);
     ExpectInvalidComponent(parsed.port);
   }
 }
 
 }  // namespace
 }  // namespace url_parse