Drop unique audio thread ID requirement.

third_party/WebKit/Source/modules/webaudio/DeferredTaskHandler.cpp

Index: third_party/WebKit/Source/modules/webaudio/DeferredTaskHandler.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/DeferredTaskHandler.cpp b/third_party/WebKit/Source/modules/webaudio/DeferredTaskHandler.cpp
index d294fe8fa80585e76e0331a63cb657d395b0f72c..e0edeaee15d341a663aa0bcd0cce91abb1ebf9df 100644
--- a/third_party/WebKit/Source/modules/webaudio/DeferredTaskHandler.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/DeferredTaskHandler.cpp
@@ -279,18 +279,9 @@ void DeferredTaskHandler::clearHandlersToBeDeleted()
     m_deletableOrphanHandlers.clear();
 }
 
-void DeferredTaskHandler::clearAudioThread()
-{
-    releaseStore(&m_audioThread, 0);
-}
-
 void DeferredTaskHandler::setAudioThreadToCurrentThread()
 {
     ASSERT(!isMainThread());
-    if (m_audioThread) {
-        ASSERT(m_audioThread == currentThread());
-        return;
-    }
     ThreadIdentifier thread = currentThread();
     releaseStore(&m_audioThread, thread);
 }