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 968a201ecc20e06eb7d4b62cd9f8378a1edc7c18..529213e32648aaa53ca125a1065c1db83d0dd481 100644
--- a/chrome/browser/resources/pdf/index-material.html
+++ b/chrome/browser/resources/pdf/index-material.html
@@ -49,10 +49,11 @@
 <viewer-error-screen id="error-screen"></viewer-error-screen>
 
 </body>
+<script src="chrome://resources/js/util.js"></script>
 <script src="main.js"></script>
-<script src="pdf.js"></script>
-<script src="viewport.js"></script>
+<script src="navigator.js"></script>
 <script src="open_pdf_params_parser.js"></script>
+<script src="pdf.js"></script>
 <script src="pdf_scripting_api.js"></script>
-<script src="chrome://resources/js/util.js"></script>
+<script src="viewport.js"></script>
 </html>