Remove ConnectivityManager from EnterprisePrivacyFeatureProvider.

It is only used in GlobalHttpPreferenceController. Move it there.

Bug: 173331190
Test: atest SettingsRoboTests
Change-Id: I62c589679052b276927d057d3d5d084bbfb57626

src/com/android/settings/enterprise/EnterprisePrivacyFeatureProviderImpl.java

@@ -146,11 +146,6 @@ public class EnterprisePrivacyFeatureProviderImpl implements EnterprisePrivacyFe
                 VpnUtils.isAlwaysOnVpnSet(mVm, managedProfileUserId);
     }
 
-    @Override
-    public boolean isGlobalHttpProxySet() {
-        return mCm.getGlobalProxy() != null;
-    }
-
     @Override
     public int getMaximumFailedPasswordsBeforeWipeInCurrentUser() {
         ComponentName owner = mDpm.getDeviceOwnerComponentOnCallingUser();