Revert of [Autofill] Enable Autofill for dynamically created forms.

components/autofill/core/browser/autofill_manager.cc

Index: components/autofill/core/browser/autofill_manager.cc
diff --git a/components/autofill/core/browser/autofill_manager.cc b/components/autofill/core/browser/autofill_manager.cc
index 55f2cf32b9414dfdcbb31c6adc3e258c9fa0b655..95126de421d1ca79cdc115bb0cad82cb4401f1e1 100644
--- a/components/autofill/core/browser/autofill_manager.cc
+++ b/components/autofill/core/browser/autofill_manager.cc
@@ -303,7 +303,7 @@
         base::Bind(&AutofillManager::UploadFormDataAsyncCallback,
                    weak_ptr_factory_.GetWeakPtr(),
                    base::Owned(submitted_form.release()),
-                   forms_loaded_timestamps_[form],
+                   forms_loaded_timestamp_,
                    initial_interaction_timestamp_,
                    timestamp));
   }
@@ -312,9 +312,15 @@
 }
 
 void AutofillManager::OnFormsSeen(const std::vector<FormData>& forms,
-                                  const TimeTicks& timestamp) {
+                                  const TimeTicks& timestamp,
+                                  autofill::FormsSeenState state) {
   if (!IsValidFormDataVector(forms))
     return;
+
+  bool is_post_document_load = state == autofill::DYNAMIC_FORMS_SEEN;
+  // If new forms were added dynamically, treat as a new page.
+  if (is_post_document_load)
+    Reset();
 
   if (!driver_->RendererIsAvailable())
     return;
@@ -328,10 +334,7 @@
   if (!enabled)
     return;
 
-  for (size_t i = 0; i < forms.size(); ++i) {
-    forms_loaded_timestamps_[forms[i]] = timestamp;
-  }
-
+  forms_loaded_timestamp_ = timestamp;
   ParseForms(forms);
 }
 
@@ -820,7 +823,7 @@
   user_did_type_ = false;
   user_did_autofill_ = false;
   user_did_edit_autofilled_field_ = false;
-  forms_loaded_timestamps_.clear();
+  forms_loaded_timestamp_ = TimeTicks();
   initial_interaction_timestamp_ = TimeTicks();
   external_delegate_->Reset();
 }