Remove calls for enabling/disabling platform notifications

Disabling proxy config notifications when browser goes in
background was not allowing proxy change listener to process
proxy change events. This was resulting in browser having wrong
proxy settings while user switches to wifi while browser is still
in background. After bringing browser back to foreground
browser was having wrong proxy settings. Fix was to not to disable
platform notifications while in background.

Change-Id: I2c3d9547cfc7d357264401da902e723e44173b69
diff --git a/src/com/android/browser/Controller.java b/src/com/android/browser/Controller.java
index 5be0c9f..c7ceb68 100644
--- a/src/com/android/browser/Controller.java
+++ b/src/com/android/browser/Controller.java
@@ -753,8 +753,6 @@
         }
         mUi.onPause();
         mNetworkHandler.onPause();
-
-        WebView.disablePlatformNotifications();
         NfcHandler.unregister(mActivity);
         mActivity.unregisterReceiver(mLowPowerReceiver);
     }
@@ -797,7 +795,6 @@
 
         mUi.onResume();
         mNetworkHandler.onResume();
-        WebView.enablePlatformNotifications();
         NfcHandler.register(mActivity, this);
         if (mVoiceResult != null) {
             mUi.onVoiceResult(mVoiceResult);