Fix invalid use of int in Zone.

test/unittests/compiler/zone-pool-unittest.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/base/utils/random-number-generator.h"
 #include "src/compiler/zone-pool.h"
 #include "test/unittests/test-utils.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 14 matching lines @@
 
   void Expect(ZonePool::StatsScope* stats, size_t current, size_t max,
               size_t total) {
     ASSERT_EQ(current, stats->GetCurrentAllocatedBytes());
     ASSERT_EQ(max, stats->GetMaxAllocatedBytes());
     ASSERT_EQ(total, stats->GetTotalAllocatedBytes());
   }
 
   size_t Allocate(Zone* zone) {
     size_t bytes = rng.NextInt(25) + 7;
-    int size_before = zone->allocation_size();
-    zone->New(static_cast<int>(bytes));
-    return static_cast<size_t>(zone->allocation_size() - size_before);
+    size_t size_before = zone->allocation_size();
+    zone->New(bytes);
+    return zone->allocation_size() - size_before;
   }
 
  private:
   ZonePool zone_pool_;
   base::RandomNumberGenerator rng;
 };
 
 
 TEST_F(ZonePoolTest, Empty) {
   ExpectForPool(0, 0, 0);
@@ skipping 105 matching lines @@
       ExpectForPool(outer_allocated, max_loop_allocation, total_allocated);
     }
   }
   Expect(&outer_stats, 0, max_loop_allocation, total_allocated);
   ExpectForPool(0, max_loop_allocation, total_allocated);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8