Enable more PPAPI tests.

chrome/test/ui/ppapi_uitest.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "build/build_config.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/automation/tab_proxy.h"
 #include "chrome/test/ui/ui_test.h"
@@ skipping 66 matching lines @@
 
 #if defined(OS_MACOSX)
 // TODO(brettw) this fails on Mac for unknown reasons.
 TEST_F(PPAPITest, DISABLED_DeviceContext2D) {
 #else
 TEST_F(PPAPITest, DeviceContext2D) {
 #endif
   RunTest(FILE_PATH_LITERAL("test_device_context_2d.html"));
 }
 
-#if defined(OS_MACOSX)
-// TODO(brettw) this fails on Mac for unknown reasons.
-TEST_F(PPAPITest, DISABLED_ImageData) {
-#else
 TEST_F(PPAPITest, ImageData) {
-#endif
   RunTest(FILE_PATH_LITERAL("test_image_data.html"));
 }
 
-TEST_F(PPAPITest, DISABLED_Buffer) {
+TEST_F(PPAPITest, Buffer) {
   RunTest(FILE_PATH_LITERAL("test_buffer.html"));
 }