Revert of Rename Heap to ThreadHeap

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 831c038fae48fcedee4865d973aa930e043fb24e..0a18808d0d111edfc258f9ae3c68c26f5468edf7 100644
--- a/third_party/WebKit/Source/core/css/resolver/MatchedPropertiesCache.h
+++ b/third_party/WebKit/Source/core/css/resolver/MatchedPropertiesCache.h
@@ -65,7 +65,7 @@
             // 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 (!ThreadHeap::isHeapObjectAlive(matchedProperties.properties)) {
+                if (!Heap::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.
@@ -77,7 +77,7 @@
         // 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 (!ThreadHeap::isHeapObjectAlive(cachedProperties))
+        if (!Heap::isHeapObjectAlive(cachedProperties))
             visitor->trace(cachedProperties);
         return false;
     }