Move gvr library proguard config to chrome_public_apk_tmpl.gni so that Chrome apk can also use it

chrome/android/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")
 import("//build/config/android/rules.gni")
 import("//build_overrides/v8.gni")
 import("//chrome/android/chrome_public_apk_tmpl.gni")
 import("//chrome/common/features.gni")
 import("//chrome/version.gni")
@@ skipping 523 matching lines @@
     forward_variables_from(invoker, "*")
 
     native_lib_version_rule = "//build/util:chrome_version_json"
 
     deps += [
       ":chrome_java",
       ":chrome_public_apk_assets",
       ":chrome_public_apk_resources",
       "//base:base_java",
     ]
-
-    if (enable_webvr && !is_java_debug) {
-      proguard_configs = [ "//third_party/gvr-android-sdk/proguard/base.flags" ]
-    }
   }
 }
 
 chrome_public_apk_tmpl_shared("chrome_public_apk") {
   android_manifest = get_target_outputs(":chrome_public_apk_manifest")
   android_manifest = android_manifest[1]
   android_manifest_dep = ":chrome_public_apk_manifest"
   apk_name = "ChromePublic"
   shared_libraries = [ ":chrome" ]
 
@@ skipping 86 matching lines @@
 instrumentation_test_apk("chrome_sync_shell_test_apk") {
   apk_name = "ChromeSyncShellTest"
   apk_under_test = ":chrome_sync_shell_apk"
   android_manifest = chrome_sync_shell_test_apk_manifest
   android_manifest_dep = ":chrome_sync_shell_test_apk_manifest"
   deps = [
     ":chrome_sync_shell_test_apk_java",
   ]
   proguard_enabled = !is_java_debug
 }