[Autofill] Fill Autocomplete correctly after suggestion.

Tbr-ing tkent@ for the TODO comment I added in WebInputElement.h

Bug: 777097
Change-Id: Ia7c9b839521211d4527f067f848cd7988a49f64c
Tbr: tkent@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/734104
Commit-Queue: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Reviewed-by: Roger McFarlane <rogerm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512553}

components/autofill/content/renderer/autofill_agent.cc

@@ -738,7 +738,7 @@ void AutofillAgent::QueryAutofillSuggestions(
 void AutofillAgent::DoFillFieldWithValue(const base::string16& value,
                                          WebInputElement* node) {
   base::AutoReset<bool> auto_reset(&ignore_text_changes_, true);
-  node->SetEditingValue(
+  node->SetAutofillValue(
       blink::WebString::FromUTF16(value.substr(0, node->MaxLength())));
   password_autofill_agent_->UpdateStateForTextChange(*node);
 }

third_party/WebKit/public/web/WebInputElement.h

@@ -73,6 +73,8 @@ class BLINK_EXPORT WebInputElement final : public WebFormControlElement {
   // Sets the value inside the text field without being sanitized. Can't be
   // used if a renderer doesn't exist or on a non text field type. Caret will
   // be moved to the end.
+  // TODO(crbug.com/777850): Remove all references to SetEditingValue, as it's
+  // not used anymore.
   void SetEditingValue(const WebString&);
   bool IsValidValue(const WebString&) const;
   bool IsChecked() const;