Inherit CSP when we inherit the security origin

This prevents attacks that use main window navigation to get out of the
existing csp constraints such as the related bug

Bug: 747847
Change-Id: I1e57b50da17f65d38088205b0a3c7c49ef2ae4d8
Reviewed-on: https://chromium-review.googlesource.com/592027
Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#492333}
void WebLocalFrameImpl::ExecuteScriptInIsolatedWorld(
    int world_id,
    const WebScriptSource* sources_in,
    unsigned num_sources) {
  DCHECK(GetFrame());
  CHECK_GT(world_id, 0);
  CHECK_LT(world_id, DOMWrapperWorld::kEmbedderWorldIdLimit);

  HeapVector<ScriptSourceCode> sources =
      CreateSourcesVector(sources_in, num_sources);
  v8::HandleScope handle_scope(ToIsolate(GetFrame()));
  GetFrame()->GetScriptController().ExecuteScriptInIsolatedWorld(world_id,
                                                                 sources, 0);
}

void WebLocalFrameImpl::ExecuteScriptInIsolatedWorld(
    int world_id,
    const WebScriptSource* sources_in,
    unsigned num_sources) {
  DCHECK(GetFrame());
  CHECK_GT(world_id, 0);
  CHECK_LT(world_id, DOMWrapperWorld::kEmbedderWorldIdLimit);

  HeapVector<ScriptSourceCode> sources =
      CreateSourcesVector(sources_in, num_sources);
  v8::HandleScope handle_scope(ToIsolate(GetFrame()));
  GetFrame()->GetScriptController().ExecuteScriptInIsolatedWorld(world_id,
                                                                 sources, 0);
}
