Revert "[inspector] doesn't run user code to stringify console method arg"

This reverts commit 82451d45.

Reason for revert:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/16923

Original change's description:
> [inspector] doesn't run user code to stringify console method arg
> 
> Otherwise user code can produce an exception and we will crash.
> 
> R=​jakob@chromium.org
> 
> Bug: chromium:736302
> Change-Id: I078150909b0348a63e8c375b508e34fc4751b4ab
> Reviewed-on: https://chromium-review.googlesource.com/565628
> Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#46566}

TBR=kozyatinskiy@chromium.org,jgruber@chromium.org,jakob@chromium.org

Change-Id: I6d7e06fad2ab6c1c894c199fe7b3b6afb2930734
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:736302
Reviewed-on: https://chromium-review.googlesource.com/567060Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46567}

src/inspector/v8-console.cc

@@ -112,10 +112,6 @@ class ConsoleHelper {
   String16 firstArgToString(const String16& defaultValue) {
     if (m_info.Length() < 1) return defaultValue;
     v8::Local<v8::String> titleValue;
-    v8::TryCatch tryCatch(m_context->GetIsolate());
-    v8::Isolate::DisallowJavascriptExecutionScope throwJs(
-        m_context->GetIsolate(),
-        v8::Isolate::DisallowJavascriptExecutionScope::THROW_ON_FAILURE);
     if (m_info[0]->IsObject()) {
       if (!m_info[0].As<v8::Object>()->ObjectProtoToString(m_context).ToLocal(
               &titleValue))

test/inspector/runtime/regression-736302-expected.txt

-crbug.com/736302
-{
-    method : Runtime.consoleAPICalled
-    params : {
-        args : [
-            [0] : {
-                type : string
-                value : 1
-            }
-        ]
-        executionContextId : <executionContextId>
-        stackTrace : {
-            callFrames : [
-                [0] : {
-                    columnNumber : 10
-                    functionName : 
-                    lineNumber : 1
-                    scriptId : <scriptId>
-                    url : 
-                }
-            ]
-        }
-        timestamp : <timestamp>
-        type : count
-    }
-}
-{
-    type : undefined
-}

test/inspector/runtime/regression-736302.js

-// Copyright 2017 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-let {session, contextGroup, Protocol} = InspectorTest.start('crbug.com/736302');
-
-(async function main() {
-  Protocol.Runtime.enable();
-  Protocol.Runtime.onConsoleAPICalled(InspectorTest.logMessage);
-  let r = await Protocol.Runtime.evaluate({expression: `
-  console.count({
-    get [Symbol.toStringTag]() {
-      throw new Error();
-    }
-  });`});
-  InspectorTest.logMessage(r.result.result);
-  InspectorTest.completeTest();
-})();