Move Contains() method to file_utils, stop relying on in extensions_protocol

chrome/browser/extensions/extension_protocol_unittest.cc

 // Copyright (c) 2006-2008 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 "chrome/browser/extensions/extension_protocol.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class ExtensionProtocolTest : public testing::Test {
 };
 
 TEST(ExtensionProtocolTest, GetPathForExtensionResource) {
 #if defined(OS_WIN)
   FilePath extension_path(FILE_PATH_LITERAL("C:\\myextension"));
   EXPECT_EQ(std::wstring(L"C:\\myextension\\foo\\bar.gif"),
             GetPathForExtensionResource(extension_path, "/foo/bar.gif").value());
   EXPECT_EQ(std::wstring(L"C:\\myextension\\"),
             GetPathForExtensionResource(extension_path, "/").value());
-  // TODO(aa): This one is a bit weird, but is what net::FileURLToFilePath()
-  // returns for this input. Investigate adding more validation.
   EXPECT_EQ(std::wstring(L"C:\\myextension\\c:\\foo.gif"),
             GetPathForExtensionResource(extension_path, "/c:/foo.gif").value());
-  EXPECT_EQ(std::wstring(L"C:\\myextension\\foo.gif"),
-            GetPathForExtensionResource(extension_path, "//foo.gif").value());
   EXPECT_EQ(std::wstring(L""),
             GetPathForExtensionResource(extension_path, "/../foo.gif").value());
 #else
   FilePath extension_path(FILE_PATH_LITERAL("/myextension"));
   EXPECT_EQ(std::wstring("/myextension/foo/bar.gif"),
             GetPathForExtensionResource(extension_path, "/foo/bar.gif").value());
   EXPECT_EQ(std::wstring("/myextension/"),
             GetPathForExtensionResource(extension_path, "/").value());
-  EXPECT_EQ(std::wstring("/myextension/foo.gif"),
-            GetPathForExtensionResource(extension_path, "//foo.gif").value());
   EXPECT_EQ(std::wstring(""),
             GetPathForExtensionResource(extension_path, "/../foo.gif").value());
 #endif
 
 
 }