Remove som GYP annotations, remove unused manifest.

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 = [
     "android_dlext.h",
     "legacy_linker_jni.cc",
     "legacy_linker_jni.h",
     "linker_jni.cc",
     "linker_jni.h",
     "modern_linker_jni.cc",
     "modern_linker_jni.h",
   ]
 
   # 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 = [
     "//build/config/sanitizers:deps",
     "//third_party/android_crazy_linker",
   ]
 }