Make classes and structures in core/style, core/plugins and core/streams fast-allocated.

Source/core/style/AppliedTextDecoration.h

Index: Source/core/style/AppliedTextDecoration.h
diff --git a/Source/core/style/AppliedTextDecoration.h b/Source/core/style/AppliedTextDecoration.h
index 216d9812c57287e170c78af4b6275c5c7497e4fe..b8eb30ce563b075fdb43b984347dcfb4b5a56bad 100644
--- a/Source/core/style/AppliedTextDecoration.h
+++ b/Source/core/style/AppliedTextDecoration.h
@@ -7,10 +7,12 @@
 
 #include "core/css/StyleColor.h"
 #include "core/style/ComputedStyleConstants.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class AppliedTextDecoration {
+    ALLOW_ONLY_INLINE_ALLOCATION();
 public:
     AppliedTextDecoration(TextDecoration, TextDecorationStyle, StyleColor);
     explicit AppliedTextDecoration(TextDecoration);