Merge //content/child/permissions into Blink's permissions module.

third_party/WebKit/Source/modules/modules.gypi

 {
   'includes': [
     '../core/core_generated.gypi',
     'modules_generated.gypi',
   ],
   'variables': {
     # Experimental hooks for embedder to provide extra IDL and source files.
     #
     # Note: this is not a supported API. If you rely on this, you will be broken
     # from time to time as the code generator changes in backward incompatible
@@ skipping 1386 matching lines @@
       'peerconnection/RTCStatsRequestImpl.cpp',
       'peerconnection/RTCStatsRequestImpl.h',
       'peerconnection/RTCStatsResponse.cpp',
       'peerconnection/RTCStatsResponse.h',
       'peerconnection/RTCVoidRequestImpl.cpp',
       'peerconnection/RTCVoidRequestImpl.h',
       'peerconnection/RTCVoidRequestPromiseImpl.cpp',
       'peerconnection/RTCVoidRequestPromiseImpl.h',
       'permissions/NavigatorPermissions.cpp',
       'permissions/NavigatorPermissions.h',
-      'permissions/PermissionController.cpp',
-      'permissions/PermissionController.h',
       'permissions/Permissions.cpp',
       'permissions/Permissions.h',
-      'permissions/PermissionCallback.cpp',
-      'permissions/PermissionCallback.h',
-      'permissions/PermissionsCallback.cpp',
-      'permissions/PermissionsCallback.h',
       'permissions/PermissionStatus.cpp',
       'permissions/PermissionStatus.h',
       'permissions/WorkerNavigatorPermissions.cpp',
       'permissions/WorkerNavigatorPermissions.h',
       'plugins/DOMMimeType.cpp',
       'plugins/DOMMimeType.h',
       'plugins/DOMMimeTypeArray.cpp',
       'plugins/DOMMimeTypeArray.h',
       'plugins/DOMPlugin.cpp',
       'plugins/DOMPlugin.h',
@@ skipping 641 matching lines @@
       'webaudio/ConvolverNodeTest.cpp',
       'webaudio/DynamicsCompressorNodeTest.cpp',
       'webaudio/ScriptProcessorNodeTest.cpp',
       'webaudio/StereoPannerNodeTest.cpp',
       'webdatabase/QuotaTrackerTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }