Move EmptyString, kWhitespace and the BOM to base.

chrome_frame/test/automation_client_mock.h

Index: chrome_frame/test/automation_client_mock.h
diff --git a/chrome_frame/test/automation_client_mock.h b/chrome_frame/test/automation_client_mock.h
index cbbbc5aa020f8d0c4971a2ce2152248c1a7de87c..ccb84d72920effe1420b27be508b4b26757ec624 100644
--- a/chrome_frame/test/automation_client_mock.h
+++ b/chrome_frame/test/automation_client_mock.h
@@ -67,7 +67,7 @@ struct MockCFDelegate : public ChromeFrameDelegateImpl {
 
   void ReplyStarted(int request_id, const char* headers) {
     request_delegate_->OnResponseStarted(request_id, "text/html", headers,
-      0, base::Time::Now(), EmptyString(), 0, net::HostPortPair(), 0);
+      0, base::Time::Now(), std::string(), 0, net::HostPortPair(), 0);
   }
 
   void ReplyData(int request_id, const std::string* data) {