Fix assertion failure in ScriptRegexp::match

Source/core/inspector/InspectorDebuggerAgent.cpp

Index: Source/core/inspector/InspectorDebuggerAgent.cpp
diff --git a/Source/core/inspector/InspectorDebuggerAgent.cpp b/Source/core/inspector/InspectorDebuggerAgent.cpp
index 2dbd4fa3a05bf6fdaccfe11ee10a082b0dd3939e..5cd3f3a99d8f6f30d615110822d9f62e5602ef13 100644
--- a/Source/core/inspector/InspectorDebuggerAgent.cpp
+++ b/Source/core/inspector/InspectorDebuggerAgent.cpp
@@ -34,8 +34,6 @@
 #include "core/inspector/ScriptAsyncCallStack.h"
 #include "core/inspector/v8/V8Debugger.h"
 #include "platform/ScriptForbiddenScope.h"
-#include "wtf/MainThread.h"
-#include "wtf/Optional.h"
 
 namespace blink {
 
@@ -262,9 +260,7 @@ bool InspectorDebuggerAgent::isPaused()
 
 PassRefPtrWillBeRawPtr<ScriptAsyncCallStack> InspectorDebuggerAgent::currentAsyncStackTraceForConsole()
 {
-    Optional<ScriptForbiddenScope::AllowUserAgentScript> allowScripting;
-    if (isMainThread())
-        allowScripting.emplace();
+    ScriptForbiddenScope::AllowUserAgentScript allowScripting;
     return m_v8DebuggerAgent->currentAsyncStackTraceForConsole();
 }