Enable chrome.gyp:browser on iOS

chrome/browser/net/spdyproxy/data_reduction_proxy_settings_ios.cc

Index: chrome/browser/net/spdyproxy/data_reduction_proxy_settings_ios.cc
diff --git a/chrome/browser/net/spdyproxy/data_reduction_proxy_settings_ios.cc b/chrome/browser/net/spdyproxy/data_reduction_proxy_settings_ios.cc
deleted file mode 100644
index 6a0df92e7a2ae1de3401f57e0e3e5dfb8afbcee7..0000000000000000000000000000000000000000
--- a/chrome/browser/net/spdyproxy/data_reduction_proxy_settings_ios.cc
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright 2013 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 "chrome/browser/net/spdyproxy/data_reduction_proxy_settings_ios.h"
-
-DataReductionProxySettingsIOS::DataReductionProxySettingsIOS()
-    : DataReductionProxySettings() {
-}