[Autofill] Pass struct by const-reference.

BUG=none
R=estade@chromium.org

Review URL: https://chromiumcodereview.appspot.com/16077005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@203094 0039d316-1c4b-4281-b951-d872f2087c98

components/autofill/browser/form_structure.cc

@@ -658,7 +658,7 @@ bool FormStructure::IsAutocheckoutEnabled() const {
   return !autocheckout_url_prefix_.empty();
 }
 
-bool FormStructure::ShouldSkipField(const FormFieldData field) const {
+bool FormStructure::ShouldSkipField(const FormFieldData& field) const {
   return (field.is_checkable || field.form_control_type == "password") &&
       !IsAutocheckoutEnabled();
 }

components/autofill/browser/form_structure.h

@@ -202,7 +202,7 @@ class FormStructure {
   bool IsAutocheckoutEnabled() const;
 
   // Returns true if field should be skipped when talking to Autofill server.
-  bool ShouldSkipField(const FormFieldData field) const;
+  bool ShouldSkipField(const FormFieldData& field) const;
 
   // Returns the minimal number of fillable fields required to start autofill.
   size_t RequiredFillableFields() const;