Refactor chromium's Linker class.

base/android/linker/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/android/config.gni")
 
 assert(is_android)
 
 # GYP: //base/base.gyp:chromium_android_linker
 shared_library("chromium_android_linker") {
   sources = [
-    "linker_jni.cc",
+    "legacy_linker_jni.cc",
   ]
 
   # The NDK contains the crazy_linker here:
   #   '<(android_ndk_root)/crazy_linker.gyp:crazy_linker'
   # However, we use our own fork.  See bug 384700.
   deps = [
     "//third_party/android_crazy_linker",
   ]
 
   # TODO(GYP):
   # The crazy linker is never instrumented.
   #'cflags!': [
   #'-finstrument-functions',
   #],
 }