Remove unnecessary uses of build_overrides/v8.gni.

content/shell/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("//third_party/icu/config.gni")
 
 generate_jni("content_shell_jni_headers") {
   jni_package = "content/shell"
   sources = [
     "java/src/org/chromium/content_shell/Shell.java",
     "java/src/org/chromium/content_shell/ShellLayoutTestUtils.java",
     "java/src/org/chromium/content_shell/ShellManager.java",
   ]
 }
@@ skipping 239 matching lines @@
   testonly = true
   deps = [
     ":content_shell_java",
     "//base:base_java",
     "//content/public/android:content_java",
     "//testing/android/native_test:native_test_java",
     "//ui/android:ui_java",
   ]
   java_files = [ "browsertests/src/org/chromium/content_shell/browsertests/ContentShellBrowserTestActivity.java" ]
 }