remove 'unsafe' from ES3 apis in gpu process

gpu/command_buffer/service/context_group.cc

Index: gpu/command_buffer/service/context_group.cc
diff --git a/gpu/command_buffer/service/context_group.cc b/gpu/command_buffer/service/context_group.cc
index 539758427695de011d2356b3860b9549633ffc1d..84938acfcbe9feeed43b2e35d9ead16c7894c97f 100644
--- a/gpu/command_buffer/service/context_group.cc
+++ b/gpu/command_buffer/service/context_group.cc
@@ -118,6 +118,13 @@ ContextGroup::ContextGroup(
 bool ContextGroup::Initialize(GLES2Decoder* decoder,
                               ContextType context_type,
                               const DisallowedFeatures& disallowed_features) {
+  if (!gpu_preferences_.enable_unsafe_es3_apis &&
+      (context_type == CONTEXT_TYPE_OPENGLES3 ||
+       context_type == CONTEXT_TYPE_WEBGL2)) {
+    DLOG(ERROR) << "ContextGroup::Initialize failed because ES3 APIs are "
+                << "not available.";
+    return false;
+  }
   if (HaveContexts()) {
     if (context_type != feature_info_->context_type()) {
       DLOG(ERROR) << "ContextGroup::Initialize failed because the type of "