Remove obsolete include of build_overrides/v8.gni

This file is no longer needed.

BUG=684096

Review-Url: https://codereview.chromium.org/2657433002
diff --git a/BUILD.gn b/BUILD.gn
index 8b837c2..b41c1cd 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -2,7 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//build_overrides/v8.gni")
 import("//testing/test.gni")
 import("pdfium.gni")
 
diff --git a/samples/BUILD.gn b/samples/BUILD.gn
index b66554d..b4baf2b 100644
--- a/samples/BUILD.gn
+++ b/samples/BUILD.gn
@@ -3,7 +3,6 @@
 # found in the LICENSE file.
 
 import("//build/config/sanitizers/sanitizers.gni")
-import("//build_overrides/v8.gni")
 import("../pdfium.gni")
 
 group("samples") {