Add utf_string_conversions to base namespace.

chrome/test/automation/tab_proxy.cc

Index: chrome/test/automation/tab_proxy.cc
diff --git a/chrome/test/automation/tab_proxy.cc b/chrome/test/automation/tab_proxy.cc
index a88307033a7cd48620bb594051e78c331963d19c..81384d159c176b1ebe6d65d377a1f60e62583f5a 100644
--- a/chrome/test/automation/tab_proxy.cc
+++ b/chrome/test/automation/tab_proxy.cc
@@ -61,7 +61,7 @@ int TabProxy::FindInPage(const std::wstring& search_string,
     return -1;
 
   AutomationMsg_Find_Params params;
-  params.search_string = WideToUTF16Hack(search_string);
+  params.search_string = base::WideToUTF16Hack(search_string);
   params.find_next = find_next;
   params.match_case = (match_case == CASE_SENSITIVE);
   params.forward = (forward == FWD);
@@ -182,7 +182,7 @@ bool TabProxy::ExecuteAndExtractString(const std::wstring& frame_xpath,
     succeeded = value->GetAsString(&read_value);
     if (succeeded) {
       // TODO(viettrungluu): remove conversion. (But should |jscript| be UTF-8?)
-      *string_value = UTF16ToWideHack(read_value);
+      *string_value = base::UTF16ToWideHack(read_value);
     }
   }
   return succeeded;