Replace string16 with base::string16.

chrome/browser/android/intent_helper.h

Index: chrome/browser/android/intent_helper.h
diff --git a/chrome/browser/android/intent_helper.h b/chrome/browser/android/intent_helper.h
index 203690309172d9196b2b036e5092e6084ac09620..95c2e7ecace620d4c843b204dac9e0fc8cb12e0a 100644
--- a/chrome/browser/android/intent_helper.h
+++ b/chrome/browser/android/intent_helper.h
@@ -13,11 +13,11 @@ namespace chrome {
 namespace android {
 
 // Triggers a send email intent.
-void SendEmail(const string16& data_email,
-               const string16& data_subject,
-               const string16& data_body,
-               const string16& data_chooser_title,
-               const string16& data_file_to_attach);
+void SendEmail(const base::string16& data_email,
+               const base::string16& data_subject,
+               const base::string16& data_body,
+               const base::string16& data_chooser_title,
+               const base::string16& data_file_to_attach);
 
 bool RegisterIntentHelper(JNIEnv* env);