Make workers inherit the large heap limit of the main isolate.

third_party/WebKit/Source/core/workers/WorkerThreadTestHelper.h

Index: third_party/WebKit/Source/core/workers/WorkerThreadTestHelper.h
diff --git a/third_party/WebKit/Source/core/workers/WorkerThreadTestHelper.h b/third_party/WebKit/Source/core/workers/WorkerThreadTestHelper.h
index c0b3849e736940d21d01d36b589bcd77283a8b10..48725e3002f17e85e479526db3c00ccfc0705670 100644
--- a/third_party/WebKit/Source/core/workers/WorkerThreadTestHelper.h
+++ b/third_party/WebKit/Source/core/workers/WorkerThreadTestHelper.h
@@ -149,7 +149,7 @@ class WorkerThreadForTest : public WorkerThread {
         KURL(ParsedURLString, "http://fake.url/"), "fake user agent", source,
         nullptr, DontPauseWorkerGlobalScopeOnStart, headers.get(), "",
         securityOrigin, clients, WebAddressSpaceLocal, nullptr, nullptr,
-        V8CacheOptionsDefault));
+        WorkerV8Settings::Default()));
   }
 
   void waitForInit() {