Remove network_prediction_enabled from profile_io_data.

Cleanup:  This member has been obsoleted by https://crrev.com/516443002.

BUG=334602

Review URL: https://codereview.chromium.org/520613004

Cr-Commit-Position: refs/heads/master@{#292980}

chrome/browser/profiles/profile_io_data.cc

@@ -465,11 +465,6 @@ void ProfileIOData::InitializeOnUIThread(Profile* profile) {
 
   media_device_id_salt_ = new MediaDeviceIDSalt(pref_service, IsOffTheRecord());
 
-  // TODO(bnc): remove per https://crbug.com/334602.
-  network_prediction_enabled_.Init(prefs::kNetworkPredictionEnabled,
-                                   pref_service);
-  network_prediction_enabled_.MoveToThread(io_message_loop_proxy);
-
   network_prediction_options_.Init(prefs::kNetworkPredictionOptions,
                                    pref_service);
 
@@ -1202,8 +1197,6 @@ void ProfileIOData::ShutdownOnUIThread(
   printing_enabled_.Destroy();
   sync_disabled_.Destroy();
   signin_allowed_.Destroy();
-  // TODO(bnc): remove per https://crbug.com/334602.
-  network_prediction_enabled_.Destroy();
   network_prediction_options_.Destroy();
   quick_check_enabled_.Destroy();
   if (media_device_id_salt_.get())

chrome/browser/profiles/profile_io_data.h

@@ -196,11 +196,6 @@ class ProfileIOData {
     return &signin_allowed_;
   }
 
-  // TODO(bnc): remove per https://crbug.com/334602.
-  BooleanPrefMember* network_prediction_enabled() const {
-    return &network_prediction_enabled_;
-  }
-
   IntegerPrefMember* network_prediction_options() const {
     return &network_prediction_options_;
   }
@@ -547,7 +542,6 @@ class ProfileIOData {
   mutable BooleanPrefMember printing_enabled_;
   mutable BooleanPrefMember sync_disabled_;
   mutable BooleanPrefMember signin_allowed_;
-  mutable BooleanPrefMember network_prediction_enabled_;
   mutable IntegerPrefMember network_prediction_options_;
   // TODO(marja): Remove session_startup_pref_ if no longer needed.
   mutable IntegerPrefMember session_startup_pref_;