Add the viewer toolbar to the PDF extension

chrome/browser/resources/pdf/polymer_loader.js

Index: chrome/browser/resources/pdf/polymer_loader.js
diff --git a/ui/keyboard/resources/polymer_loader.js b/chrome/browser/resources/pdf/polymer_loader.js
similarity index 74%
copy from ui/keyboard/resources/polymer_loader.js
copy to chrome/browser/resources/pdf/polymer_loader.js
index 259bd39b839e5c2aff82080b3d0a66e19db0c410..d6199ef2dd4df416782b878cdea326436769c656 100644
--- a/ui/keyboard/resources/polymer_loader.js
+++ b/chrome/browser/resources/pdf/polymer_loader.js
@@ -2,10 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+(function() {
 // This is necessary because polymer currently doesn't handle the configuration
 // where native Custom Elements are available but native Shadow DOM is not.
 // TODO(bshe): remove this line when polymer supports the configuration.
 document.registerElement = undefined;
 
-<include src="../../../third_party/polymer/platform/platform.js"></include>
-<include src="../../../third_party/polymer/polymer/polymer.js"></include>
+<include src="../../../../third_party/polymer/platform/platform.js"></include>
+})();