Autofill: Modify various utility function to deal with unowned form fields.

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 e659492b2e86cd55d7038e36f1f3cfc87e3f7b40..be6b5dd9c98a1cbeb20c3d9576f5e58c586ca14a 100644
--- a/components/autofill/content/renderer/form_cache.h
+++ b/components/autofill/content/renderer/form_cache.h
@@ -32,15 +32,6 @@ class FormCache {
   FormCache();
   ~FormCache();
 
-  // Get all form control elements from |elements| that are not part of a form.
-  // If |fieldsets| is not NULL, also append the fieldsets encountered that are
-  // not part of a form.
-  // Exposed for sharing with tests.
-  static std::vector<blink::WebFormControlElement>
-      GetUnownedAutofillableFormFieldElements(
-          const blink::WebElementCollection& elements,
-          std::vector<blink::WebElement>* fieldsets);
-
   // Scans the DOM in |frame| extracting and storing forms that have not been
   // seen before. Returns the extracted forms.
   std::vector<FormData> ExtractNewForms(const blink::WebFrame& frame);