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

chrome/android/java/src/org/chromium/chrome/browser/preferences/PrefServiceBridge.java

Index: chrome/android/java/src/org/chromium/chrome/browser/preferences/PrefServiceBridge.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/preferences/PrefServiceBridge.java b/chrome/android/java/src/org/chromium/chrome/browser/preferences/PrefServiceBridge.java
index a926dd9d0a424e2e5aa6f72771423e8c0303ad69..fbea4bbc13ffc719a6c931aa76e6e7595704e475 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/preferences/PrefServiceBridge.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/preferences/PrefServiceBridge.java
@@ -601,14 +601,6 @@ public final class PrefServiceBridge {
     }
 
     /**
-     * @return whether there is a user set value for kNetworkPredictionEnabled.  This should only be
-     * used for preference migration. See http://crbug.com/334602
-     */
-    public boolean obsoleteNetworkPredictionEnabledHasUserSetting() {
-        return nativeObsoleteNetworkPredictionEnabledHasUserSetting();
-    }
-
-    /**
      * @return whether there is a user set value for kNetworkPredictionOptions.  This should only be
      * used for preference migration. See http://crbug.com/334602
      */
@@ -617,14 +609,6 @@ public final class PrefServiceBridge {
     }
 
     /**
-     * @return the user set value for kNetworkPredictionEnabled. This should only be used for
-     * preference migration. See http://crbug.com/334602
-     */
-    public boolean obsoleteGetNetworkPredictionEnabledUserPrefValue() {
-        return nativeObsoleteGetNetworkPredictionEnabledUserPrefValue();
-    }
-
-    /**
      * @return Network predictions preference.
      */
     public boolean getNetworkPredictionEnabled() {
@@ -1203,9 +1187,7 @@ public final class PrefServiceBridge {
     private native void nativeSetSafeBrowsingEnabled(boolean enabled);
     private native boolean nativeGetSafeBrowsingManaged();
     private native boolean nativeGetNetworkPredictionManaged();
-    private native boolean nativeObsoleteNetworkPredictionEnabledHasUserSetting();
     private native boolean nativeObsoleteNetworkPredictionOptionsHasUserSetting();
-    private native boolean nativeObsoleteGetNetworkPredictionEnabledUserPrefValue();
     private native boolean nativeGetNetworkPredictionEnabled();
     private native void nativeSetNetworkPredictionEnabled(boolean enabled);
     private native void nativeSetResolveNavigationErrorEnabled(boolean enabled);