Make sure the PDF material toolbar gets hidden after loading.

chrome/browser/resources/pdf/pdf.js

Index: chrome/browser/resources/pdf/pdf.js
diff --git a/chrome/browser/resources/pdf/pdf.js b/chrome/browser/resources/pdf/pdf.js
index 23d9bbed4d1c6e2d674267d5e3abfdd3fb74adc9..5c71f7d8a799b3094f11f609c60871fc04c4454b 100644
--- a/chrome/browser/resources/pdf/pdf.js
+++ b/chrome/browser/resources/pdf/pdf.js
@@ -436,6 +436,8 @@ PDFViewer.prototype = {
         this.passwordScreen_.active = false;
       }
     } else if (progress == 100) {
+      if (this.isMaterial_)
+        this.uiManager_.showUi();

[Sam McNally, 2015/03/02 02:01:01]

How about setting the initial timeout in the constructor and creating the
UiManager here? Either that or add a public method to just start the hide
timeout. Calling showUi here is odd.

[raymes, 2015/03/02 02:23:15]

Done.

       // Document load complete.
       if (this.lastViewportPosition_)
         this.viewport_.position = this.lastViewportPosition_;