Remove unused tests folder.

tests/angle_end2end_tests.gypi

-# Copyright (c) 2014 The ANGLE Project Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-# TODO(jmadill): update Chromium's pointers to src/tests
-
-{
-    'includes':
-    [
-        '../src/tests/angle_end2end_tests.gypi',
-    ],
-}

tests/angle_tests/ANGLETest.h

-//
-// Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-//
-
-// TODO(jmadill): Remove this file once we're ready on the Chromium side.
-
-#include "../../src/tests/end2end_tests/ANGLETest.h"

tests/angle_unittests.gypi

-# Copyright (c) 2014 The ANGLE Project Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-# TODO(jmadill): update Chromium's pointers to src/tests
-
-{
-    'includes':
-    [
-        '../src/tests/angle_unittests.gypi',
-    ],
-}