Fix FileIO and FileRef PPAPI tests to match changes in

chrome/test/ui/ppapi_uitest.cc

Index: chrome/test/ui/ppapi_uitest.cc
diff --git a/chrome/test/ui/ppapi_uitest.cc b/chrome/test/ui/ppapi_uitest.cc
index 3a5e3047f53bb11de9cfe5318abbc9e42970927e..6c7d88412f62fee7604ba14936fa2f5e4c08d7ff 100644
--- a/chrome/test/ui/ppapi_uitest.cc
+++ b/chrome/test/ui/ppapi_uitest.cc
@@ -154,13 +154,11 @@ TEST_F(PPAPITest, Var) {
   RunTest("Var");
 }
 
-// TODO(dumi): figure out why this test is flaky / crashing.
-TEST_F(PPAPITest, DISABLED_FileIO) {
+TEST_F(PPAPITest, FileIO) {
   RunTestViaHTTP("FileIO");
 }
 
-// TODO(dumi): figure out why this test is flaky / crashing.
-TEST_F(PPAPITest, DISABLED_FileRef) {
+TEST_F(PPAPITest, FileRef) {
   RunTestViaHTTP("FileRef");
 }