Use C++ style type casts.

src/heap-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 243 matching lines @@
 MaybeObject* Heap::NumberFromInt32(
     int32_t value, PretenureFlag pretenure) {
   if (Smi::IsValid(value)) return Smi::FromInt(value);
   // Bypass NumberFromDouble to avoid various redundant checks.
   return AllocateHeapNumber(FastI2D(value), pretenure);
 }
 
 
 MaybeObject* Heap::NumberFromUint32(
     uint32_t value, PretenureFlag pretenure) {
-  if ((int32_t)value >= 0 && Smi::IsValid((int32_t)value)) {
-    return Smi::FromInt((int32_t)value);
+  if (static_cast<int32_t>(value) >= 0 &&
+      Smi::IsValid(static_cast<int32_t>(value))) {
+    return Smi::FromInt(static_cast<int32_t>(value));
   }
   // Bypass NumberFromDouble to avoid various redundant checks.
   return AllocateHeapNumber(FastUI2D(value), pretenure);
 }
 
 
 void Heap::FinalizeExternalString(String* string) {
   ASSERT(string->IsExternalString());
   v8::String::ExternalStringResourceBase** resource_addr =
       reinterpret_cast<v8::String::ExternalStringResourceBase**>(
@@ skipping 563 matching lines @@
 AssertNoAllocation::~AssertNoAllocation() { }
 DisableAssertNoAllocation::DisableAssertNoAllocation() { }
 DisableAssertNoAllocation::~DisableAssertNoAllocation() { }
 
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_INL_H_