[inspector] added missing tryCatch in InjectedScript::create

R=dgozman@chromium.org

Bug: chromium:752019
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I1a64a26e5e5d44757edd5b887d140b6b855cecab
Reviewed-on: https://chromium-review.googlesource.com/636300Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47626}

src/inspector/injected-script.cc

@@ -256,6 +256,7 @@ std::unique_ptr<InjectedScript> InjectedScript::create(
     InspectedContext* inspectedContext, int sessionId) {
   v8::Isolate* isolate = inspectedContext->isolate();
   v8::HandleScope handles(isolate);
+  v8::TryCatch tryCatch(isolate);
   v8::Local<v8::Context> context = inspectedContext->context();
   v8::Context::Scope scope(context);
   v8::MicrotasksScope microtasksScope(isolate,