Add utf_string_conversions to base namespace.

chrome/browser/extensions/page_action_browsertest.cc

Index: chrome/browser/extensions/page_action_browsertest.cc
diff --git a/chrome/browser/extensions/page_action_browsertest.cc b/chrome/browser/extensions/page_action_browsertest.cc
index 75a4525c47c7d8c7a2bda59f8fb85c9f349ed559..aa8262ffddd069c5c61f6cc859f98befb4d0a2ce 100644
--- a/chrome/browser/extensions/page_action_browsertest.cc
+++ b/chrome/browser/extensions/page_action_browsertest.cc
@@ -190,13 +190,13 @@ IN_PROC_BROWSER_TEST_F(ExtensionBrowserTest, TitleLocalizationPageAction) {
 
   ASSERT_EQ(size_before + 1, service->extensions()->size());
 
-  EXPECT_STREQ(WideToUTF8(L"Hreggvi\u00F0ur: l10n page action").c_str(),
+  EXPECT_STREQ(base::WideToUTF8(L"Hreggvi\u00F0ur: l10n page action").c_str(),
                extension->description().c_str());
-  EXPECT_STREQ(WideToUTF8(L"Hreggvi\u00F0ur is my name").c_str(),
+  EXPECT_STREQ(base::WideToUTF8(L"Hreggvi\u00F0ur is my name").c_str(),
                extension->name().c_str());
   int tab_id = ExtensionTabUtil::GetTabId(
       browser()->tab_strip_model()->GetActiveWebContents());
-  EXPECT_STREQ(WideToUTF8(L"Hreggvi\u00F0ur").c_str(),
+  EXPECT_STREQ(base::WideToUTF8(L"Hreggvi\u00F0ur").c_str(),
                ExtensionActionManager::Get(browser()->profile())->
                GetPageAction(*extension)->
                GetTitle(tab_id).c_str());