Fix build due to breakage introduced in r57918.

chrome/browser/search_engines/template_url_unittest.cc

 // Copyright (c) 2006-2010 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 "base/base_paths.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/rlz/rlz.h"
 #include "chrome/browser/search_engines/search_terms_data.h"
@@ skipping 11 matching lines @@
     return google_base_url_;
   }
 
   virtual std::string GetApplicationLocale() const {
     return "yy";
   }
 
 #if defined(OS_WIN) && defined(GOOGLE_CHROME_BUILD)
   // Returns the value for the Chrome Omnibox rlz.
   virtual std::wstring GetRlzParameterValue() const {
-    return "";
+    return L"";
   }
 #endif
 
  private:
   std::string google_base_url_;
 
   DISALLOW_COPY_AND_ASSIGN(TestSearchTermsData);
 };
 
 class TemplateURLTest : public testing::Test {
@@ skipping 490 matching lines @@
 TEST_F(TemplateURLTest, ParseURLNestedParameter) {
   TemplateURLRef url_ref("{%s", 0, 0);
   TemplateURLRef::Replacements replacements;
   bool valid = false;
   EXPECT_EQ("{", url_ref.ParseURL("{{searchTerms}", &replacements, &valid));
   ASSERT_EQ(1U, replacements.size());
   EXPECT_EQ(static_cast<size_t>(1), replacements[0].index);
   EXPECT_EQ(TemplateURLRef::SEARCH_TERMS, replacements[0].type);
   EXPECT_TRUE(valid);
 }