Revert "Implement a JavaScript API for document scanning"

chrome/common/extensions/docs/examples/api/document_scan/scan.js

-// 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.
-
-var requestButton = document.getElementById("requestButton");
-var scanButton = document.getElementById('scanButton');
-var scannedImages = document.getElementById('scannedImages');
-var waitAnimation = document.getElementById('waitAnimation');
-var imageMimeType;
-
-function setOnlyChild(parent, child) {
-  while (parent.firstChild) {
-    parent.removeChild(parent.firstChild);
-  }
-  parent.appendChild(child);
-}
-
-var gotPermission = function(result) {
-  waitAnimation.style.display = 'block';
-  requestButton.style.display = 'none';
-  scanButton.style.display = 'block';
-  console.log('App was granted the "documentScan" permission.');
-  waitAnimation.style.display = 'none';
-};
-
-var permissionObj = {permissions: ['documentScan']};
-
-requestButton.addEventListener('click', function() {
-  waitAnimation.style.display = 'block';
-  chrome.permissions.request( permissionObj, function(result) {
-    if (result) {
-      gotPermission();
-    } else {
-      console.log('App was not granted the "documentScan" permission.');
-      console.log(chrome.runtime.lastError);
-    }
-  });
-});
-
-var onScanCompleted = function(scan_results) {
-  waitAnimation.style.display = 'none';
-  if (chrome.runtime.lastError) {
-    console.log('Scan failed: ' + chrome.runtime.lastError.message);
-    return;
-  }
-  numImages = scan_results.dataUrls.length;
-  console.log('Scan completed with ' + numImages + ' images.');
-  for (var i = 0; i < numImages; i++) {
-    urlData = scan_results.dataUrls[i]
-    console.log('Scan ' + i + ' data length ' +
-                urlData.length + '.');
-    console.log('URL is ' + urlData);
-    var scannedImage = document.createElement('img');
-    scannedImage.src = urlData;
-    scannedImages.insertBefore(scannedImage, scannedImages.firstChild);
-  }
-};
-
-scanButton.addEventListener('click', function() {
-  var scanProperties = {};
-  waitAnimation.style.display = 'block';
-  chrome.documentScan.scan(scanProperties, onScanCompleted);
-});
-
-chrome.permissions.contains(permissionObj, function(result) {
-  if (result) {
-    gotPermission();
-  }
-});