Make sure the PDF material toolbar gets hidden after loading.

chrome/browser/resources/pdf/ui_manager.js

Index: chrome/browser/resources/pdf/ui_manager.js
diff --git a/chrome/browser/resources/pdf/ui_manager.js b/chrome/browser/resources/pdf/ui_manager.js
index 53bb72010c0e9be5fc8afa9c4abe6fcc43105f55..f16535c81627a5a6e640a6fdc5d39ac2751c197b 100644
--- a/chrome/browser/resources/pdf/ui_manager.js
+++ b/chrome/browser/resources/pdf/ui_manager.js
@@ -35,9 +35,7 @@ UiManager.prototype = {
     for (var i = 0; i < this.panes_.length; i++)
       this.panes_[i].showIfOpenedByUser();
 
-    if (this.uiTimeout_)
-      clearTimeout(this.uiTimeout_);
-    this.uiTimeout_ = setTimeout(this.hideUi_.bind(this), HIDE_TIMEOUT);
+    this.hideUiAfterTimeout();
   },
 
   /**
@@ -48,5 +46,14 @@ UiManager.prototype = {
     this.toolbar_.hide();
     for (var i = 0; i < this.panes_.length; i++)
       this.panes_[i].hideIfOpenedByUser();
+  },
+
+  /**
+   * Hide the toolbar after the HIDE_TIMEOUT has elapsed.
+   */
+  hideUiAfterTimeout: function() {
+    if (this.uiTimeout_)
+      clearTimeout(this.uiTimeout_);
+    this.uiTimeout_ = setTimeout(this.hideUi_.bind(this), HIDE_TIMEOUT);
   }
 };