Add a kill switch for all of Web Bluetooth.

chrome/browser/permissions/permission_context_base.h

 // 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.
 
 #ifndef CHROME_BROWSER_PERMISSIONS_PERMISSION_CONTEXT_BASE_H_
 #define CHROME_BROWSER_PERMISSIONS_PERMISSION_CONTEXT_BASE_H_
 
 #include "base/callback.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/memory/ref_counted.h"
@@ skipping 44 matching lines @@
 // examples.
 
 class PermissionContextBase : public KeyedService {
  public:
   PermissionContextBase(Profile* profile,
                         const content::PermissionType permission_type,
                         const ContentSettingsType content_settings_type);
   ~PermissionContextBase() override;
 
   // A field trial used to enable the global permissions kill switch.
-  // This is public for testing purposes.
+  // This is public so permissions that don't yet inherit from
+  // PermissionContextBase can use it.
   static const char kPermissionsKillSwitchFieldStudy[];
 
   // The field trial param to enable the global permissions kill switch.
-  // This is public for testing purposes.
+  // This is public so permissions that don't yet inherit from
+  // PermissionContextBase can use it.
   static const char kPermissionsKillSwitchBlockedValue[];
 
   // The renderer is requesting permission to push messages.
   // When the answer to a permission request has been determined, |callback|
   // should be called with the result.
   virtual void RequestPermission(content::WebContents* web_contents,
                                  const PermissionRequestID& id,
                                  const GURL& requesting_frame,
                                  const BrowserPermissionCallback& callback);
 
@@ skipping 82 matching lines @@
 #endif
   base::ScopedPtrHashMap<std::string, scoped_ptr<PermissionBubbleRequest>>
       pending_bubbles_;
 
   // Must be the last member, to ensure that it will be
   // destroyed first, which will invalidate weak pointers
   base::WeakPtrFactory<PermissionContextBase> weak_factory_;
 };
 
 #endif  // CHROME_BROWSER_PERMISSIONS_PERMISSION_CONTEXT_BASE_H_