Revert of [fsp] Enable the File System Provider API for extensions. (patchset...

Revert of [fsp] Enable the File System Provider API for extensions. (patchset #2 id:20001 of https://codereview.chromium.org/527663002/)

Reason for revert:
Speculative revert, failed ChromiumOS browser_tests.

[1422/1422] FileSystemProviderApiTest.Extension (11555 ms)
1 test failed:
    FileSystemProviderApiTest.Extension

http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%28dbg%29%282%29/builds/11812

Original issue's description:
> [fsp] Enable the File System Provider API for extensions.
>
> Previously, only apps were allowed to use this api, however most clients will
> be actually written as extensions.
>
> TEST=browser_tests: *FileSystemProvider*Extension*
> BUG=409487
>
> Committed: https://chromium.googlesource.com/chromium/src/+/4acb869459901c6fa627473bb15b8a0f6190cc11

TBR=benwells@chromium.org,kalman@chromium.org,mtomasz@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=409487

Review URL: https://codereview.chromium.org/537603002

Cr-Commit-Position: refs/heads/master@{#293148}

chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_apitest.cc

@@ -120,10 +120,4 @@ IN_PROC_BROWSER_TEST_F(FileSystemProviderApiTest, WriteFile) {
       << message_;
 }
 
-IN_PROC_BROWSER_TEST_F(FileSystemProviderApiTest, Extension) {
-  ASSERT_TRUE(RunPlatformAppTestWithFlags("file_system_provider/extension",
-                                          kFlagLoadAsComponent))
-      << message_;
-}
-
 }  // namespace extensions

chrome/common/extensions/api/_permission_features.json

@@ -559,7 +559,7 @@
   }],
   "fileSystemProvider": {
     "channel": "dev",
-    "extension_types": ["extension", "platform_app"]
+    "extension_types": ["platform_app"]
   },
   "firstRunPrivate": {
     "channel": "stable",

chrome/common/extensions/docs/templates/public/extensions/fileSystemProvider.html

-{{+partials.standard_extensions_api api:apis.extensions.fileSystemProvider intro:intros.fileSystemProvider/}}

chrome/test/data/extensions/api_test/file_system_provider/extension/manifest.json

-{
-  "key": "MIGdMA0GCSqGSIb3DQEBAQUAA4GLADCBhwKBgQDOuXEIuoK1kAkBe0SKiJn/N9oNn3oUxGa4dwj40MnJqPn+w0aR2vuyocm0R4Drp67aYwtLjOVPF4CICRq6ICP6eU07gGwQxGdZ7HJASXV8hm0tab5I70oJmRLfFJyVAMCeWlFaOGq05v2i6EbifZM0qO5xALKNGQt+yjXi5INM5wIBIw==",
-  "name": "chrome.fileSystemProvider.mount in extensions",
-  "version": "0.1",
-  "manifest_version": 2,
-  "description": "Test for chrome.fileSystemProvider.mount() in an extension.",
-  "permissions": ["fileSystemProvider", "fileBrowserPrivate"],
-  "background": {
-    "persistent": false,
-    "scripts": [
-      "chrome-extension://gfnblenhaahcnmfdbebgincjohfkbnch/test_util.js",
-      "test.js"
-    ]
-  }
-}

chrome/test/data/extensions/api_test/file_system_provider/extension/test.js

-// Copyright 2014 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.
-
-'use strict';
-
-chrome.test.runTests([
-  // Tests if mounting succeeds when invoked from an extension. Note that all
-  // other tests are implemented as apps.
-  function mount() {
-    var onTestSuccess = chrome.test.callbackPass();
-    chrome.fileSystemProvider.mount(
-        {fileSystemId: 'file-system-id', displayName: 'file-system-name'},
-        function() {
-          onTestSuccess();
-        },
-        function(error) {
-          chrome.test.fail();
-        });
-  },
-]);