Fix various issues from r343263.

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

Index: chrome/browser/ui/webui/print_preview/print_preview_distiller.h
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_distiller.h b/chrome/browser/ui/webui/print_preview/print_preview_distiller.h
index d9ef5dbac3e4bd90967728ed321b97f00bcabb89..8b8a53578a26eb68d473ee21e7b6a07d5599465d 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_distiller.h
+++ b/chrome/browser/ui/webui/print_preview/print_preview_distiller.h
@@ -5,14 +5,13 @@
 #ifndef CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_DISTILLER_H_
 #define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_DISTILLER_H_
 
-#include "base/callback.h"
+#include "base/callback_forward.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/values.h"
-#include "content/public/browser/web_contents_observer.h"

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

nit: not used

 
-namespace net {
-class URLRequestContextGetter;

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

nit: not used

+namespace content {
+class WebContents;
 }
 
 // This class controls the rendering of the distilled contents
@@ -20,27 +19,20 @@ class URLRequestContextGetter;
 class PrintPreviewDistiller {
  public:
   PrintPreviewDistiller(content::WebContents* source_web_contents,
-                        base::Closure on_failed_callback,

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

pass callbacks by const ref

+                        const base::Closure& on_failed_callback,
                         scoped_ptr<base::DictionaryValue> settings);
   ~PrintPreviewDistiller();
 
  private:
   class WebContentsDelegateImpl;
 
-  // Create the web contents with a default
-  // size. |session_storage_namespace| indicates the namespace that
-  // the distiller content renderer's page should be part of.
+  // Create the web contents with a default size.
   void CreateDestinationWebContents(
-      content::SessionStorageNamespace* session_storage_namespace,
       content::WebContents* source_web_contents,
       scoped_ptr<base::DictionaryValue> settings,
-      base::Closure on_failed_callback);
+      const base::Closure& on_failed_callback);
 
-  content::WebContents* CreateWebContents(
-      content::SessionStorageNamespace* session_storage_namespace,
-      content::WebContents* source_web_contents);
-
-  // The distilled rendered WebContents; may be null.
+  // The WebContents for the distilled rendering; may be null.
   scoped_ptr<content::WebContents> web_contents_;
 
   scoped_ptr<WebContentsDelegateImpl> web_contents_delegate_;