Move chrome.appWindow to chrome.app.window.

chrome/common/extensions/docs/static/app_hardware.html

 <div id="pageData-name" class="pageData">Accessing Hardware Devices</div>
 <div id="pageData-showTOC" class="pageData">true</div>
 
 <p>
 This doc shows you how packaged apps can connect to USB devices
 and read from and write to a user's serial ports.
 See also the reference docs for the
 <a href="experimental.usb.html">USB API</a>
 and the
 <a href="experimental.serial.html">Serial API</a>.
@@ skipping 20 matching lines @@
 
 <h3>Manifest requirement</h3>
 
 <p>
 You must add the "usb" permission
 to the manifest file:
 </p>
 
 <pre>
 "permissions": [
-  "appWindow",
+  "app.window",
   "experimental",
   "usb"
 ]
 </pre>
 
 <h3>Finding a device</h3>
 
 <p>
 Every device in a USB bus is identified
 by its vendor and product IDs.
@@ skipping 635 matching lines @@
 You can flush your serial device buffer by issuing the flush command on the API:
 </p>
 
 <pre>
 var flushSerial=function(str) {
   chrome.experimental.serial.flush(connectionInfo.connectionId, onFlush);
 }
 </pre>
 
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