Refactoring of code by moving navigate_() to separate file.

chrome/browser/resources/pdf/index-material.html

Index: chrome/browser/resources/pdf/index-material.html
diff --git a/chrome/browser/resources/pdf/index-material.html b/chrome/browser/resources/pdf/index-material.html
index 21d76b06cf025686b6eca6af4776840376598333..2240d23d71047d11170218e160af286b5ff024cb 100644
--- a/chrome/browser/resources/pdf/index-material.html
+++ b/chrome/browser/resources/pdf/index-material.html
@@ -53,10 +53,11 @@
 <viewer-error-screen id="error-screen"></viewer-error-screen>
 
 </body>
-<script src="main.js"></script>
-<script src="pdf.js"></script>
 <script src="viewport.js"></script>
 <script src="open_pdf_params_parser.js"></script>
+<script src="navigator.js"></script>
 <script src="pdf_scripting_api.js"></script>
 <script src="chrome://resources/js/util.js"></script>
+<script src="pdf.js"></script>
+<script src="main.js"></script>
 </html>