Remove PrefObserver usage, batch 9.

chrome/browser/printing/print_view_manager.cc

Index: chrome/browser/printing/print_view_manager.cc
diff --git a/chrome/browser/printing/print_view_manager.cc b/chrome/browser/printing/print_view_manager.cc
index 410c1f44fd7f84372a108dacc2618ad24519c37c..bddbeb9d64965ab04874e77ba38d5560a6d15fb9 100644
--- a/chrome/browser/printing/print_view_manager.cc
+++ b/chrome/browser/printing/print_view_manager.cc
@@ -80,9 +80,11 @@ PrintViewManager::PrintViewManager(content::WebContents* web_contents)
                  content::Source<content::WebContents>(web_contents));
   Profile* profile =
       Profile::FromBrowserContext(web_contents->GetBrowserContext());
-  printing_enabled_.Init(prefs::kPrintingEnabled,
-                         profile->GetPrefs(),
-                         this);
+  printing_enabled_.Init(
+      prefs::kPrintingEnabled,
+      profile->GetPrefs(),
+      base::Bind(&PrintViewManager::UpdateScriptedPrintingBlocked,
+                 base::Unretained(this)));
 }
 
 PrintViewManager::~PrintViewManager() {
@@ -394,11 +396,6 @@ void PrintViewManager::Observe(int type,
   }
 }
 
-void PrintViewManager::OnPreferenceChanged(PrefServiceBase* service,
-                                           const std::string& pref_name) {
-  UpdateScriptedPrintingBlocked();
-}
-
 void PrintViewManager::OnNotifyPrintJobEvent(
     const JobEventDetails& event_details) {
   switch (event_details.type()) {