Replace string16 with base::string16.

chrome/browser/android/intent_helper.cc

Index: chrome/browser/android/intent_helper.cc
diff --git a/chrome/browser/android/intent_helper.cc b/chrome/browser/android/intent_helper.cc
index 347f3fc165627a0c471c6bcfd290289e2bd0715c..1a9f36bc271965e7485e6f668462def0b02d91d3 100644
--- a/chrome/browser/android/intent_helper.cc
+++ b/chrome/browser/android/intent_helper.cc
@@ -17,11 +17,11 @@ using base::android::ConvertUTF16ToJavaString;
 namespace chrome {
 namespace android {
 
-void SendEmail(const string16& d_email,
-               const string16& d_subject,
-               const string16& d_body,
-               const string16& d_chooser_title,
-               const string16& d_file_to_attach) {
+void SendEmail(const base::string16& d_email,
+               const base::string16& d_subject,
+               const base::string16& d_body,
+               const base::string16& d_chooser_title,
+               const base::string16& d_file_to_attach) {
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jstring> j_email = ConvertUTF16ToJavaString(env, d_email);
   ScopedJavaLocalRef<jstring> j_subject =