Remove PrefObserver usages, batch 10.

chrome/browser/ui/webui/ntp/ntp_resource_cache_android.cc

Index: chrome/browser/ui/webui/ntp/ntp_resource_cache_android.cc
diff --git a/chrome/browser/ui/webui/ntp/ntp_resource_cache_android.cc b/chrome/browser/ui/webui/ntp/ntp_resource_cache_android.cc
index 23f9a99a9e6fb2c108cd40644afd3c5d3ef13373..30277f3ebc1c2f7227843c4d56f61f010ca49bb6 100644
--- a/chrome/browser/ui/webui/ntp/ntp_resource_cache_android.cc
+++ b/chrome/browser/ui/webui/ntp/ntp_resource_cache_android.cc
@@ -50,13 +50,12 @@ base::RefCountedMemory* NTPResourceCache::GetNewTabCSS(bool is_incognito) {
 }
 
 void NTPResourceCache::Observe(int type,
-    const content::NotificationSource& source,
-    const content::NotificationDetails& details) {
+                               const content::NotificationSource& source,
+                               const content::NotificationDetails& details) {
   // No notifications necessary in Android.
 }
 
-void NTPResourceCache::OnPreferenceChanged(PrefServiceBase* service,
-                                           const std::string& pref_name) {
+void NTPResourceCache::OnPreferenceChanged() {
   // No notifications necessary in Android.
 }