Extension API: Rename contentSettings.misc to .global and rename preferences under it.

chrome/common/extensions/docs/samples.json

 {
   "api": {
     "chrome.bookmarks.create": "bookmarks.html#method-create",
     "chrome.bookmarks.export": "bookmarks.html#method-export",
     "chrome.bookmarks.get": "bookmarks.html#method-get",
     "chrome.bookmarks.getChildren": "bookmarks.html#method-getChildren",
     "chrome.bookmarks.getRecent": "bookmarks.html#method-getRecent",
     "chrome.bookmarks.getTree": "bookmarks.html#method-getTree",
     "chrome.bookmarks.import": "bookmarks.html#method-import",
     "chrome.bookmarks.move": "bookmarks.html#method-move",
@@ skipping 657 matching lines @@
       "icon": null,
       "id": "0bf0930a32829dfb77170535ecb27adc2de3998a",
       "name": "Enable\/disable referrers API example extension",
       "path": "examples\/api\/preferences\/enableReferrer\/",
       "protocols": [],
       "search_string": "ENABLE\/DISABLE REFERRERS API EXAMPLE EXTENSION SAMPLE EXTENSION WHICH DEMONSTRATES HOW TO ACCESS A PREFERENCE. BROWSER_ACTION CONTENTSETTINGS EXPERIMENTAL POPUP CHROME.EXTENSION.ISALLOWEDINCOGNITOACCESS",
       "source_files": [
         "manifest.json",
         "popup.html"
       ],
-      "source_hash": "97a0009e38509549b1dd3eca84ee7aacd3aae4d7",
+      "source_hash": "2919c196fec8721c240b529b7763c36f7330d986",
       "zip_path": "examples\/api\/preferences\/enableReferrer.zip"
     },
     {
       "api_calls": [],
       "description": "A sample extension which uses Google Analytics to track usage.",
       "features": [
         "background_page",
         "browser_action",
         "popup"
       ],
@@ skipping 1133 matching lines @@
       "source_files": [
         "manifest.json",
         "popup.html",
         "sample.css"
       ],
       "source_hash": "c8bfc2b60f25c24dc3c5aaf75dd635c9419df66d",
       "zip_path": "examples\/api\/extension\/isAllowedAccess.zip"
     }
   ]
 }