Clean up a few more unused globals.

chrome/browser/drive/drive_api_util.cc

Index: chrome/browser/drive/drive_api_util.cc
diff --git a/chrome/browser/drive/drive_api_util.cc b/chrome/browser/drive/drive_api_util.cc
index 8606dc22e8929ef2bd6105819cbfe9783b471bdc..776ea5c93eddb496cef65c31ba1046197f6c29eb 100644
--- a/chrome/browser/drive/drive_api_util.cc
+++ b/chrome/browser/drive/drive_api_util.cc
@@ -28,11 +28,8 @@ namespace {
 // Google Apps MIME types:
 const char kGoogleDocumentMimeType[] = "application/vnd.google-apps.document";
 const char kGoogleDrawingMimeType[] = "application/vnd.google-apps.drawing";
-const char kGoogleFormMimeType[] = "application/vnd.google-apps.form";
 const char kGooglePresentationMimeType[] =
     "application/vnd.google-apps.presentation";
-const char kGoogleScriptMimeType[] = "application/vnd.google-apps.script";
-const char kGoogleSiteMimeType[] = "application/vnd.google-apps.site";
 const char kGoogleSpreadsheetMimeType[] =
     "application/vnd.google-apps.spreadsheet";
 const char kGoogleTableMimeType[] = "application/vnd.google-apps.table";