Make Zone::New() and Zone::NewArray() usable w/o v8.h.

src/zone.h

Index: src/zone.h
diff --git a/src/zone.h b/src/zone.h
index a689f1218f0d4e5d085e18a9287e482dace6699d..a690b8d8caf1bb6ec3144908f37b4e8736c982d8 100644
--- a/src/zone.h
+++ b/src/zone.h
@@ -5,6 +5,8 @@
 #ifndef V8_ZONE_H_
 #define V8_ZONE_H_
 
+#include <limits>
+
 #include "src/allocation.h"
 #include "src/base/logging.h"
 #include "src/globals.h"
@@ -38,10 +40,14 @@ class Zone {
   ~Zone();
   // Allocate 'size' bytes of memory in the Zone; expands the Zone by
   // allocating new segments of memory on demand using malloc().
-  inline void* New(int size);
+  void* New(int size);
 
   template <typename T>
-  inline T* NewArray(int length);
+  T* NewArray(int length) {
+    CHECK(std::numeric_limits<int>::max() / static_cast<int>(sizeof(T)) >
+          length);
+    return static_cast<T*>(New(length * sizeof(T)));
+  }
 
   // Deletes all objects and free all memory allocated in the Zone. Keeps one
   // small (size <= kMaximumKeptSegmentSize) segment around if it finds one.