Make blink classes and structures in core/css fast-allocated

Source/core/css/parser/MediaQueryBlockWatcher.h

Index: Source/core/css/parser/MediaQueryBlockWatcher.h
diff --git a/Source/core/css/parser/MediaQueryBlockWatcher.h b/Source/core/css/parser/MediaQueryBlockWatcher.h
index c48a2d59af2c21b896936aa1696c982c3a039840..33fde891189206dbdcadbd9e79b493e723bf943d 100644
--- a/Source/core/css/parser/MediaQueryBlockWatcher.h
+++ b/Source/core/css/parser/MediaQueryBlockWatcher.h
@@ -6,14 +6,15 @@
 #define MediaQueryBlockWatcher_h
 
 #include "core/CoreExport.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class CSSParserToken;
 
 class CORE_EXPORT MediaQueryBlockWatcher {
+    STACK_ALLOCATED();
 public:
-
     MediaQueryBlockWatcher();
     void handleToken(const CSSParserToken&);
     unsigned blockLevel() const { return m_blockLevel; }