Revert of Release Oilpan heap singletons prior to LSan leak detection.

third_party/WebKit/Source/web/WebKit.cpp

Index: third_party/WebKit/Source/web/WebKit.cpp
diff --git a/third_party/WebKit/Source/web/WebKit.cpp b/third_party/WebKit/Source/web/WebKit.cpp
index f6375b0ad367a324edcdb4297a9d97207a419b5e..c892d8b06b2c170be6d89a38a70f71033ec2914e 100644
--- a/third_party/WebKit/Source/web/WebKit.cpp
+++ b/third_party/WebKit/Source/web/WebKit.cpp
@@ -195,21 +195,6 @@
 
 void shutdown()
 {
-#if defined(LEAK_SANITIZER)
-    // If LSan is about to perform leak detection, release all the registered
-    // static Persistent<> root references to global caches that Blink keeps,
-    // followed by GCs to clear out all they referred to. A full v8 GC cycle
-    // is needed to flush out all garbage.
-    //
-    // This is not needed for caches over non-Oilpan objects, as they're
-    // not scanned by LSan due to being held in non-global storage
-    // ("static" references inside functions/methods.)
-    if (ThreadState* threadState = ThreadState::current()) {
-        threadState->releaseStaticPersistentNodes();
-        Heap::collectAllGarbage();
-    }
-#endif
-
     // currentThread() is null if we are running on a thread without a message loop.
     if (Platform::current()->currentThread()) {
         Platform::current()->unregisterMemoryDumpProvider(WebCacheMemoryDumpProvider::instance());