Fix various issues from r343263.

chrome/browser/ui/webui/print_preview/print_preview_handler.h

Index: chrome/browser/ui/webui/print_preview/print_preview_handler.h
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_handler.h b/chrome/browser/ui/webui/print_preview/print_preview_handler.h
index 7e927282cc4f97884955bb3619459cd64a796b0d..e0875a3162b02688c6dbf099b31078f4b85d8003 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_handler.h
+++ b/chrome/browser/ui/webui/print_preview/print_preview_handler.h
@@ -337,7 +337,10 @@ class PrintPreviewHandler
   // Called when the DOM Distiller determines whether or not this page can
   // be distilled.
   // |distillable|: Whether or not this page can be distilled.
-  void HandleIsPageDistillableResult(bool distillable);

[Lei Zhang, 2015/08/14 05:44:35]

nit: name it consistently with everything else.

+  void OnGotPageDistillableResult(bool distillable);
+
+  // Called if the DOM Distiller failed.
+  void OnDistillerFailed();
 
   // Register/unregister from notifications of changes done to the GAIA
   // cookie.
@@ -395,8 +398,8 @@ class PrintPreviewHandler
   // notify the test if it was a successful save, only that it was attempted.
   base::Closure pdf_file_saved_closure_;
 
-  // A print preview that is responsible for rendering the page after

[Lei Zhang, 2015/08/14 05:44:36]

A PrintPreviewDistiller != "a print preview"

-  // being processed by the DOM Distiller.
+  // The class that is responsible for rendering the page after being processed
+  // by the DOM Distiller.
   scoped_ptr<PrintPreviewDistiller> print_preview_distiller_;
 
   base::WeakPtrFactory<PrintPreviewHandler> weak_factory_;