Refactor the Heap into ThreadHeap to prepare for per thread heaps

third_party/WebKit/Source/core/css/resolver/MatchedPropertiesCache.h

Index: third_party/WebKit/Source/core/css/resolver/MatchedPropertiesCache.h
diff --git a/third_party/WebKit/Source/core/css/resolver/MatchedPropertiesCache.h b/third_party/WebKit/Source/core/css/resolver/MatchedPropertiesCache.h
index c7d8d6e9d401a99562c0dbcfe7df2d3bf2bc6ae8..87467a6c60fcbb949e3a56b121448ffc838d2cc4 100644
--- a/third_party/WebKit/Source/core/css/resolver/MatchedPropertiesCache.h
+++ b/third_party/WebKit/Source/core/css/resolver/MatchedPropertiesCache.h
@@ -70,7 +70,7 @@ struct CachedMatchedPropertiesHashTraits : HashTraits<Member<CachedMatchedProper
             // in the CachedMatchedProperties value contain a dead "properties" field.
             // If there is a dead field the entire cache entry is removed.
             for (const auto& matchedProperties : cachedProperties->matchedProperties) {
-                if (!Heap::isHeapObjectAlive(matchedProperties.properties)) {
+                if (!ThreadHeap::isHeapObjectAlive(matchedProperties.properties)) {
                     // For now report the cache entry as dead. This might not
                     // be the final result if in a subsequent call for this entry,
                     // the "properties" field has been marked via another path.
@@ -82,7 +82,7 @@ struct CachedMatchedPropertiesHashTraits : HashTraits<Member<CachedMatchedProper
         // had a dead "properties" field so trace CachedMatchedProperties strongly.
         // FIXME: traceInCollection is also called from WeakProcessing to check if the entry is dead.
         // Avoid calling trace in that case by only calling trace when cachedProperties is not yet marked.
-        if (!Heap::isHeapObjectAlive(cachedProperties))
+        if (!ThreadHeap::isHeapObjectAlive(cachedProperties))
             visitor->trace(cachedProperties);
         return false;
     }