Remove NetPrefObserver class and two prefs that do not do anything.

chrome/browser/android/preferences/pref_service_bridge.cc

Index: chrome/browser/android/preferences/pref_service_bridge.cc
diff --git a/chrome/browser/android/preferences/pref_service_bridge.cc b/chrome/browser/android/preferences/pref_service_bridge.cc
index de2f9d2bb46b3e4ef1d40d27c45451b93eb83036..a569da7b95f068cb1f4e70e1ba455c95db0221f5 100644
--- a/chrome/browser/android/preferences/pref_service_bridge.cc
+++ b/chrome/browser/android/preferences/pref_service_bridge.cc
@@ -1018,13 +1018,6 @@ static void SetNetworkPredictionEnabled(JNIEnv* env,
               : chrome_browser_net::NETWORK_PREDICTION_NEVER);
 }
 
-static jboolean ObsoleteNetworkPredictionEnabledHasUserSetting(
-    JNIEnv* env,
-    const JavaParamRef<jobject>& obj) {
-  return GetPrefService()->GetUserPrefValue(
-      prefs::kNetworkPredictionEnabled) != NULL;
-}
-
 static jboolean ObsoleteNetworkPredictionOptionsHasUserSetting(
     JNIEnv* env,
     const JavaParamRef<jobject>& obj) {
@@ -1032,17 +1025,6 @@ static jboolean ObsoleteNetworkPredictionOptionsHasUserSetting(
       prefs::kNetworkPredictionOptions) != NULL;
 }
 
-static jboolean ObsoleteGetNetworkPredictionEnabledUserPrefValue(
-    JNIEnv* env,
-    const JavaParamRef<jobject>& obj) {
-  const base::Value* network_prediction_enabled =
-      GetPrefService()->GetUserPrefValue(prefs::kNetworkPredictionEnabled);
-  DCHECK(network_prediction_enabled);
-  bool value = false;
-  DCHECK(network_prediction_enabled->GetAsBoolean(&value));
-  return value;
-}
-
 static void SetResolveNavigationErrorEnabled(JNIEnv* env,
                                              const JavaParamRef<jobject>& obj,
                                              jboolean enabled) {