[Autofill] Migrate ContentAutofillDriver<-->AutofillAgent IPCs to mojo.

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 19d6562aecb72d0c1ae85d48808c8723f9b81d3b..2125ac29d7200f87b8e6105dad6019e7cd16ac59 100644
--- a/components/autofill/content/renderer/password_autofill_agent.cc
+++ b/components/autofill/content/renderer/password_autofill_agent.cc
@@ -26,6 +26,7 @@
 #include "components/autofill/core/common/form_field_data.h"
 #include "components/autofill/core/common/password_form.h"
 #include "components/autofill/core/common/password_form_fill_data.h"
+#include "content/public/common/service_registry.h"
 #include "content/public/renderer/document_state.h"
 #include "content/public/renderer/navigation_state.h"
 #include "content/public/renderer/render_frame.h"
@@ -559,6 +560,10 @@ PasswordAutofillAgent::PasswordAutofillAgent(content::RenderFrame* render_frame)
 PasswordAutofillAgent::~PasswordAutofillAgent() {
 }
 
+void PasswordAutofillAgent::SetAutofillAgent(AutofillAgent* autofill_agent) {
+  autofill_agent_ = autofill_agent;
+}
+
 PasswordAutofillAgent::PasswordValueGatekeeper::PasswordValueGatekeeper()
     : was_user_gesture_seen_(false) {
 }
@@ -1411,7 +1416,7 @@ bool PasswordAutofillAgent::ShowSuggestionPopup(
 
   if (user_input.isPasswordField() && !user_input.isAutofilled() &&
       !user_input.value().isEmpty()) {
-    Send(new AutofillHostMsg_HidePopup(routing_id()));
+    GetMojoAutofillDriver()->HidePopup();
     return false;
   }
 
@@ -1480,4 +1485,9 @@ bool PasswordAutofillAgent::ProvisionallySavedPasswordIsValid() {
          provisionally_saved_form_->new_password_value.empty());
 }
 
+const mojom::AutofillDriverPtr& PasswordAutofillAgent::GetMojoAutofillDriver() {
+  DCHECK(autofill_agent_);
+  return autofill_agent_->GetMojoAutofillDriver();
+}
+
 }  // namespace autofill