Oilpan: Introduce class MainThreadOnly

Source/platform/heap/HeapTest.cpp

Index: Source/platform/heap/HeapTest.cpp
diff --git a/Source/platform/heap/HeapTest.cpp b/Source/platform/heap/HeapTest.cpp
index 9dcfd8d19d3ea408a74076f1fe0ce33f77ed4ee9..639e1c040045c25fcf037aa95a2ac0c0788f3c49 100644
--- a/Source/platform/heap/HeapTest.cpp
+++ b/Source/platform/heap/HeapTest.cpp
@@ -73,8 +73,6 @@ private:
     int m_x;
 };
 
-USED_FROM_MULTIPLE_THREADS(IntWrapper);
-
 class ThreadMarker {
 public:
     ThreadMarker() : m_creatingThread(reinterpret_cast<ThreadState*>(0)), m_num(0) { }
@@ -1734,7 +1732,7 @@ TEST(HeapTest, NoAllocation)
     EXPECT_TRUE(ThreadState::current()->isAllocationAllowed());
     {
         // Disallow allocation
-        NoAllocationScope<AnyThread> noAllocationScope;
+        NoAllocationScope<AnyThreadAffinity> noAllocationScope;
         EXPECT_FALSE(ThreadState::current()->isAllocationAllowed());
     }
     EXPECT_TRUE(ThreadState::current()->isAllocationAllowed());