Add supports that allow Autofill to be initiated from textarea field

components/autofill/content/renderer/form_cache.h

Index: components/autofill/content/renderer/form_cache.h
diff --git a/components/autofill/content/renderer/form_cache.h b/components/autofill/content/renderer/form_cache.h
index 3cb2525cbd5d2802580782956f7b876565a3c677..1f97d073137874e028a4a6e7b00a99eaede33a75 100644
--- a/components/autofill/content/renderer/form_cache.h
+++ b/components/autofill/content/renderer/form_cache.h
@@ -13,6 +13,7 @@
 
 namespace blink {
 class WebDocument;
+class WebFormControlElement;
 class WebFormElement;
 class WebFrame;
 class WebInputElement;
@@ -50,7 +51,7 @@ class FormCache {
 
   // Clears the values of all input elements in the form that contains
   // |element|.  Returns false if the form is not found.
-  bool ClearFormWithElement(const blink::WebInputElement& element);
+  bool ClearFormWithElement(const blink::WebFormControlElement& element);
 
   // For each field in the |form|, sets the field's placeholder text to the
   // field's overall predicted type.  Also sets the title to include the field's