Fix captureVisibleTab doc string.

tools/json_schema_compiler/test/tabs.json

 [
   {
     "namespace": "tabs",
     "description": "The tabs API.",
     "types": [
       {
         "id": "Tab",
         "type": "object",
         "properties": {
           "id": {"type": "integer", "minimum": 0, "description": "The ID of the tab. Tab IDs are unique within a browser session."},
@@ skipping 473 matching lines @@
                 "name": "language",
                 "description": "An ISO language code such as <code>en</code> or <code>fr</code>. For a complete list of languages supported by this method, see <a href='http://src.chromium.org/viewvc/chrome/trunk/src/third_party/cld/languages/internal/languages.cc'>kLanguageInfoTable</a>. The 2nd to 4th columns will be checked and the first non-NULL value will be returned except for Simplified Chinese for which zh-CN will be returned. For an unknown language, <code>und</code> will be returned."
               }
             ]
           }
         ]
       },
       {
         "name": "captureVisibleTab",
         "type": "function",
-        "description": "Captures the visible area of the currently active tab in the specified window. You must have <a href='manifest.html#permissions'>host permission</a> for the URL displayed by the tab.",
+        "description": "Captures the visible area of the currently active tab in the specified window. You must have <a href='manifest.html#permissions'>&lt;all_urls&gt;</a> permission to use this method.",
         "parameters": [
           {
             "type": "integer",
             "name": "windowId",
             "minimum": 0,
             "optional": true,
             "description": "The target window. Defaults to the <a href='windows.html#current-window'>current window</a>."
           },
           {
             "type": "object",
@@ skipping 256 matching lines @@
             "name": "removeInfo",
             "properties": {
               "isWindowClosing": {"type": "boolean", "description": "True when the tab is being closed because its window is being closed." }
             }
           }
         ]
       }
     ]
   }
 ]