binding: Retires ExceptionState::throwIfNeeded().

third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp

Index: third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp
diff --git a/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp b/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp
index 4e1085e5ea2f5555338f704e0ce50a5733ee2c32..0d317bdbad102559cf8eb1f140562f7d9fb094c0 100644
--- a/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp
+++ b/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp
@@ -631,11 +631,13 @@ bool XMLHttpRequest::initSend(ExceptionState& exceptionState)
         return false;
     }
 
-    if (!m_async && exceptionState.isolate() && v8::MicrotasksScope::IsRunningMicrotasks(exceptionState.isolate())) {
-        UseCounter::count(getExecutionContext(), UseCounter::During_Microtask_SyncXHR);
+    if (!m_async) {
+        v8::Isolate* isolate = v8::Isolate::GetCurrent();
+        if (isolate && v8::MicrotasksScope::IsRunningMicrotasks(isolate)) {
+            UseCounter::count(getExecutionContext(), UseCounter::During_Microtask_SyncXHR);
+        }
     }
 
-
     m_error = false;
     return true;
 }