Tidy up Android's is-tablet functionality.

sync/util/session_utils_android.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <jni.h>
 #include <sys/system_properties.h>
 
 #include "sync/util/session_utils_android.h"
 
 #include "base/android/jni_android.h"
@@ skipping 49 matching lines @@
       GetAndroidIdJNI(env, GetContentResolver(env));
   return ConvertJavaStringToUTF8(android_id);
 }
 
 std::string GetModel() {
   char model[PROP_VALUE_MAX];
   __system_property_get("ro.product.model", model);
   return model;
 }
 
-bool IsTabletUi() {
-  NOTIMPLEMENTED() << "TODO(yfriedman): Upstream this";
-  return true;
-}
-
 }  // namespace internal
 }  // namespace syncer