Add utf_string_conversions to base namespace.

chrome/browser/extensions/browser_action_apitest.cc

Index: chrome/browser/extensions/browser_action_apitest.cc
diff --git a/chrome/browser/extensions/browser_action_apitest.cc b/chrome/browser/extensions/browser_action_apitest.cc
index c09a3d292470b720f8e3a109f275266edd8a252b..2b3a220845ab37c5604f3fd5f7a2a145b55880c5 100644
--- a/chrome/browser/extensions/browser_action_apitest.cc
+++ b/chrome/browser/extensions/browser_action_apitest.cc
@@ -19,12 +19,13 @@ IN_PROC_BROWSER_TEST_F(ExtensionBrowserTest, TitleLocalizationBrowserAction) {
 
   ASSERT_EQ(size_before + 1, service->extensions()->size());
 
-  EXPECT_STREQ(WideToUTF8(L"Hreggvi\u00F0ur: l10n browser 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: l10n browser action").c_str(),
+      extension->description().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(),
                extension->browser_action()->GetTitle(tab_id).c_str());
 }