Enable per thread heap on DedicatedWorker

third_party/WebKit/Source/core/workers/DedicatedWorkerThread.cpp

Index: third_party/WebKit/Source/core/workers/DedicatedWorkerThread.cpp
diff --git a/third_party/WebKit/Source/core/workers/DedicatedWorkerThread.cpp b/third_party/WebKit/Source/core/workers/DedicatedWorkerThread.cpp
index 999f26b2cf2e543b85a01477e5308a0b0be82ef9..4c5cd141660f459f2c7bd3bbee734547f1ea5eb5 100644
--- a/third_party/WebKit/Source/core/workers/DedicatedWorkerThread.cpp
+++ b/third_party/WebKit/Source/core/workers/DedicatedWorkerThread.cpp
@@ -46,7 +46,7 @@ std::unique_ptr<DedicatedWorkerThread> DedicatedWorkerThread::create(PassRefPtr<
 
 DedicatedWorkerThread::DedicatedWorkerThread(PassRefPtr<WorkerLoaderProxy> workerLoaderProxy, InProcessWorkerObjectProxy& workerObjectProxy, double timeOrigin)
     : WorkerThread(std::move(workerLoaderProxy), workerObjectProxy)
-    , m_workerBackingThread(WorkerBackingThread::create("DedicatedWorker Thread", BlinkGC::MainThreadHeapMode))
+    , m_workerBackingThread(WorkerBackingThread::create("DedicatedWorker Thread", BlinkGC::PerThreadHeapMode))
     , m_workerObjectProxy(workerObjectProxy)
     , m_timeOrigin(timeOrigin)
 {