With LSan, run initial heap cleaning GCs during shutdown.

third_party/WebKit/Source/platform/heap/ThreadState.cpp

Index: third_party/WebKit/Source/platform/heap/ThreadState.cpp
diff --git a/third_party/WebKit/Source/platform/heap/ThreadState.cpp b/third_party/WebKit/Source/platform/heap/ThreadState.cpp
index f11c93be01d7ae46318b0a448654beddbc2b995f..e8910cbfa8b093e742f3ab7989a1fcba2e7263f0 100644
--- a/third_party/WebKit/Source/platform/heap/ThreadState.cpp
+++ b/third_party/WebKit/Source/platform/heap/ThreadState.cpp
@@ -264,6 +264,13 @@ void ThreadState::cleanupMainThread()
 {
     ASSERT(isMainThread());
 
+#if defined(LEAK_SANITIZER)
+    // See comment below, clear out most garbage before releasing static
+    // persistents should some of the finalizers depend on touching
+    // these persistents.
+    ThreadHeap::collectAllGarbage();
+#endif
+
     releaseStaticPersistentNodes();
 
 #if defined(LEAK_SANITIZER)