replace COMPILE_ASSERT with static_assert in public/platform/

public/platform/WebPrivatePtr.h

Index: public/platform/WebPrivatePtr.h
diff --git a/public/platform/WebPrivatePtr.h b/public/platform/WebPrivatePtr.h
index 360f646d876582ef2c3c315f33f42a21adfb5735..07b84db35c5dccc9f6e46def38fbe1f358cb8d75 100644
--- a/public/platform/WebPrivatePtr.h
+++ b/public/platform/WebPrivatePtr.h
@@ -138,13 +138,13 @@ class PtrStorage : public PtrStorageImpl<T, LifetimeOf<T>::value> {
 public:
     static PtrStorage& fromSlot(void** slot)
     {
-        COMPILE_ASSERT(sizeof(PtrStorage) == sizeof(void*), PtrStorage_must_be_pointer_size);
+        static_assert(sizeof(PtrStorage) == sizeof(void*), "PtrStorage must be the size of a pointer");
         return *reinterpret_cast<PtrStorage*>(slot);
     }
 
     static const PtrStorage& fromSlot(void* const* slot)
     {
-        COMPILE_ASSERT(sizeof(PtrStorage) == sizeof(void*), PtrStorage_must_be_pointer_size);
+        static_assert(sizeof(PtrStorage) == sizeof(void*), "PtrStorage must be the size of a pointer");
         return *reinterpret_cast<const PtrStorage*>(slot);
     }