mac: Prepare most test code for -Wunused-functions too.

chrome/browser/drive/fake_drive_service.cc

Index: chrome/browser/drive/fake_drive_service.cc
diff --git a/chrome/browser/drive/fake_drive_service.cc b/chrome/browser/drive/fake_drive_service.cc
index 352e517b2fb8509ffc67b70b1923e2e5b0da2b42..cd6d55beed15562b3eb1fc0d6acc24e7077db0cc 100644
--- a/chrome/browser/drive/fake_drive_service.cc
+++ b/chrome/browser/drive/fake_drive_service.cc
@@ -105,13 +105,6 @@ bool EntryMatchWithQuery(const ResourceEntry& entry,
   return true;
 }
 
-// Returns |url| without query parameter.
-GURL RemoveQueryParameter(const GURL& url) {
-  GURL::Replacements replacements;
-  replacements.ClearQuery();
-  return url.ReplaceComponents(replacements);
-}
-
 void ScheduleUploadRangeCallback(const UploadRangeCallback& callback,
                                  int64 start_position,
                                  int64 end_position,