Add dummy implementation of about_flags for Android.

chrome/browser/about_flags_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.
+
+// Minimalist dummy implementation of about_flags.h for Android.
+
+#include "chrome/browser/about_flags.h"
+
+namespace about_flags {
+
+void ConvertFlagsToSwitches(PrefService*, CommandLine*) {}
+
+void SetExperimentEnabled(PrefService*, const std::string&, bool) {}
+
+void RemoveFlagsSwitches(std::map<std::string, CommandLine::StringType>*) {}
+
+void RecordUMAStatistics(const PrefService*) {}
+
+}  // namespace about_flags