[inspector] Don't call prototype's toString on objects.

Just rely on calling toString. This matches other vendor's implementations.

BUG=chromium:948257
R=dgozman@chromium.org

Change-Id: I325a12dd47712263a1ef4deee0bb2de9c4a1c656
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1545124Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60617}

src/inspector/v8-console.cc

@@ -125,14 +125,8 @@ class ConsoleHelper {
     }
     v8::Local<v8::String> titleValue;
     v8::TryCatch tryCatch(m_context->GetIsolate());
-    if (m_info[0]->IsObject()) {
-      if (!m_info[0].As<v8::Object>()->ObjectProtoToString(m_context).ToLocal(
-              &titleValue))
-        return defaultValue;
-    } else {
-      if (!m_info[0]->ToString(m_context).ToLocal(&titleValue))
-        return defaultValue;
-    }
+    if (!m_info[0]->ToString(m_context).ToLocal(&titleValue))
+      return defaultValue;
     return toProtocolString(m_context->GetIsolate(), titleValue);
   }