Prepare the infrastructure for password overrides.

components/autofill/content/renderer/password_autofill_agent.cc

Index: components/autofill/content/renderer/password_autofill_agent.cc
diff --git a/components/autofill/content/renderer/password_autofill_agent.cc b/components/autofill/content/renderer/password_autofill_agent.cc
index eb2e06dbe78683c9c03c13020eb30d85bad58718..c0a12764613f4a355d98ef5f307460792df5d3c7 100644
--- a/components/autofill/content/renderer/password_autofill_agent.cc
+++ b/components/autofill/content/renderer/password_autofill_agent.cc
@@ -965,8 +965,8 @@ bool PasswordAutofillAgent::OnMessageReceived(const IPC::Message& message) {
   IPC_BEGIN_MESSAGE_MAP(PasswordAutofillAgent, message)
     IPC_MESSAGE_HANDLER(AutofillMsg_FillPasswordForm, OnFillPasswordForm)
     IPC_MESSAGE_HANDLER(AutofillMsg_SetLoggingState, OnSetLoggingState)
-    IPC_MESSAGE_HANDLER(AutofillMsg_AutofillUsernameDataReceived,
-                        OnAutofillUsernameDataReceived)
+    IPC_MESSAGE_HANDLER(AutofillMsg_AutofillUsernameAndPasswordDataReceived,
+                        OnAutofillUsernameAndPasswordDataReceived)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -1236,8 +1236,8 @@ void PasswordAutofillAgent::OnSetLoggingState(bool active) {
   logging_state_active_ = active;
 }
 
-void PasswordAutofillAgent::OnAutofillUsernameDataReceived(
-    const FormDataFieldDataMap& predictions) {
+void PasswordAutofillAgent::OnAutofillUsernameAndPasswordDataReceived(
+    const FormsPredictionsMap& predictions) {
   form_predictions_ = predictions;
 }