Added jinja variable target_sdk_version to chrome_public_apk_manifest

chrome/android/java_staging/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2015 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. -->
 
 <!--
 Note: This is a jinja2 template, processed at build time into the final manifest.
 
 Blocks denoted with { % block some_name % }foo{ % endblock % } can be overridden
 by a child template that "extends" this file.
 -->
 
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="{{ manifest_package }}"
     tools:ignore="MissingVersion">
     <!-- android:versionCode and android:versionName is set through gyp. See build/common.gypi -->
 
-    <uses-sdk android:minSdkVersion="{{min_sdk_version}}" android:targetSdkVersion="22" />
+    <uses-sdk android:minSdkVersion="{{min_sdk_version}}" android:targetSdkVersion="{{target_sdk_version}}" />
     <uses-feature android:glEsVersion="0x00020000" />
 
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
     <uses-permission android:name="android.permission.CAMERA" />
     <uses-permission android:name="android.permission.GET_ACCOUNTS"/>
     <uses-permission android:name="android.permission.INTERNET"/>
     <uses-permission android:name="android.permission.MANAGE_ACCOUNTS"/>
@@ skipping 553 matching lines @@
         <meta-data android:name="org.chromium.content.browser.SMART_CLIP_PROVIDER"
             android:value="org.chromium.content.browser.SmartClipProvider"/>
         <meta-data android:name="org.chromium.components.service_tab_launcher.SERVICE_TAB_LAUNCHER"
                    android:value="org.chromium.chrome.browser.ChromeServiceTabLauncher" />
 
         {% block extra_application_definitions %}
         {% endblock %}
     </application>
 </manifest>