GuestView: Move lifetime management out of content

extensions/common/api/guest_view_internal.json

 // 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.
 
 [
   {
     "namespace": "guestViewInternal",
     "compiler_options": {
       "implemented_in": "extensions/browser/api/guest_view/guest_view_internal_api.h"
     },
@@ skipping 49 matching lines @@
             "parameters": [
               {
                 "type": "integer",
                 "name": "instanceId"
               }
             ]
           }
         ]
       },
       {
+        "name": "destroyGuest",
+        "type": "function",
+        "parameters": [
+          {
+            "type": "integer",
+            "name": "instanceId"
+          }
+        ]
+      },
+      {
         "name": "setAutoSize",
         "type": "function",
         "parameters": [
           {
             "type": "integer",
             "name": "instanceId",
             "description": "The instance ID of the guest <webview> process. This not exposed to developers through the API."
           },
           {
             "$ref": "AutoSizeParams",
             "name": "params"
           }
         ]
       }
     ]
   }
 ]