Change the OOP PDF plugin to use BrowserPlugin mime type handling.

chrome/browser/resources/pdf/main.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.
+
+'use strict';
+
+<include src="../../../../ui/webui/resources/js/util.js">
+<include src="open_pdf_params_parser.js">
+<include src="pdf.js">
+<include src="pdf_scripting_api.js">
+<include src="viewport.js">
+
+/**
+ * Global PDFViewer object, accessible for testing.
+ * @type Object
+ */
+var viewer;
+
+/**
+ * Entrypoint for starting the PDF viewer. This function obtains the details
+ * of the PDF 'stream' (the data that points to the PDF) and constructs a
+ * PDFViewer object with it.
+ */
+(function main() {
+  // If the viewer is started from the browser plugin, the view ID will be
+  // passed in which identifies the instance of the plugin.
+  var params = window.location.search.substring(1).split('=');
+  if (params.length == 2 && params[0] == 'id') {
+    var viewId = params[1];
+
+    // Send a message to the background page to obtain the stream details. It
+    // will run the callback function passed in to initialize the viewer.
+    chrome.runtime.sendMessage(
+        'mhjfbmdgcfjbbpaeojofohoefgiehjai',
+        {viewId: viewId},
+        function(streamDetails) { viewer = new PDFViewer(streamDetails); });
+    return;
+  }
+
+  // The viewer may be started directly by passing in the URL of the PDF to load
+  // as the query string. This is used for print preview in particular. The URL
+  // of this page will be of the form
+  // 'chrome-extension://<extension id>?<pdf url>'. We pull out the <pdf url>
+  // part here.
+  var url = window.location.search.substring(1);
+  var streamDetails = {
+    streamUrl: url,
+    originalUrl: url,
+    responseHeaders: ''
+  };
+  viewer = new PDFViewer(streamDetails);
+})();