Flush form cache when next document is loaded to avoid Document leak.

components/autofill/content/renderer/autofill_agent.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/autofill/content/renderer/autofill_agent.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_split.h"
@@ skipping 163 matching lines @@
 }
 
 void AutofillAgent::DidFinishDocumentLoad(WebLocalFrame* frame) {
   // If the main frame just finished loading, we should process it.
   if (!frame->parent())
     main_frame_processed_ = false;
 
   ProcessForms(*frame);
 }
 
+void AutofillAgent::DidCommitProvisionalLoad(WebLocalFrame* frame,
+                                             bool is_new_navigation) {
+  form_cache_.ResetFrame(*frame);
+}
+
 void AutofillAgent::FrameDetached(WebFrame* frame) {
   form_cache_.ResetFrame(*frame);
 }
 
 void AutofillAgent::FrameWillClose(WebFrame* frame) {
   if (in_flight_request_form_.isNull())
     return;
 
   for (WebFrame* temp = in_flight_request_form_.document().frame();
        temp; temp = temp->parent()) {
@@ skipping 531 matching lines @@
     // parsed form.
     if (frame && !frame->parent() && !frame->isLoading()) {
       ProcessForms(*frame);
       password_autofill_agent_->OnDynamicFormsSeen(frame);
       return;
     }
   }
 }
 
 }  // namespace autofill