Move DidChangeScrollOffset to RenderFrameObserver

BUG=433486

Review URL: https://codereview.chromium.org/812663002

Cr-Commit-Position: refs/heads/master@{#308704}
diff --git a/components/autofill/content/renderer/autofill_agent.cc b/components/autofill/content/renderer/autofill_agent.cc
index 16c8c0f..e316821 100644
--- a/components/autofill/content/renderer/autofill_agent.cc
+++ b/components/autofill/content/renderer/autofill_agent.cc
@@ -212,10 +212,7 @@
   }
 }
 
-void AutofillAgent::DidChangeScrollOffset(WebLocalFrame* frame) {
-  if (frame != render_frame()->GetWebFrame())
-    return;
-
+void AutofillAgent::DidChangeScrollOffset() {
   HidePopup();
 }
 
@@ -822,11 +819,6 @@
   agent_->WillSubmitForm(frame, form);
 }
 
-void AutofillAgent::LegacyAutofillAgent::DidChangeScrollOffset(
-    WebLocalFrame* frame) {
-  agent_->DidChangeScrollOffset(frame);
-}
-
 void AutofillAgent::LegacyAutofillAgent::FocusedNodeChanged(
     const WebNode& node) {
   agent_->FocusedNodeChanged(node);