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

Source/core/style/GridLength.h

Index: Source/core/style/GridLength.h
diff --git a/Source/core/style/GridLength.h b/Source/core/style/GridLength.h
index 611d180148f58617a6b6920abbd99301cb64e8b1..8f50f37962e77cb30f3adbb161dbfb22942d8c7d 100644
--- a/Source/core/style/GridLength.h
+++ b/Source/core/style/GridLength.h
@@ -32,6 +32,7 @@
 #define GridLength_h
 
 #include "platform/Length.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
@@ -39,6 +40,7 @@ namespace blink {
 // or <flex>. This class avoids spreading the knowledge of <flex> throughout the layout directory by adding
 // an new unit to Length.h.
 class GridLength {
+    DISALLOW_ALLOCATION();
 public:
     GridLength(const Length& length)
         : m_length(length)