fix unused variables in test-heap-profiler.cc to fix compilation with GCC-4.6

test/cctest/test-heap-profiler.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 //
 // Tests for heap profiler
 
 #include "v8.h"
 
 #include "cctest.h"
 #include "heap-profiler.h"
 #include "snapshot.h"
 #include "utils-inl.h"
@@ skipping 763 matching lines @@
     CHECK_EQ(1, stats_update.intervals_count());
     CHECK_EQ(3, stats_update.numbers_written());
     CHECK_LT(0, stats_update.entries_size());
     CHECK_EQ(0, stats_update.first_interval_index());
   }
 
   // No data expected in update because nothing has happened.
   CHECK_EQ(0, GetHeapStatsUpdate().numbers_written());
   {
     v8::HandleScope inner_scope_1;
-    v8::Local<v8::String> string1 = v8_str("string1");
+    v8_str("string1");
     {
       // Single chunk of data with one new entry expected in update.
       TestStatsStream stats_update = GetHeapStatsUpdate();
       CHECK_EQ(1, stats_update.intervals_count());
       CHECK_EQ(3, stats_update.numbers_written());
       CHECK_LT(0, stats_update.entries_size());
       CHECK_EQ(1, stats_update.entries_count());
       CHECK_EQ(2, stats_update.first_interval_index());
     }
 
     // No data expected in update because nothing happened.
     CHECK_EQ(0, GetHeapStatsUpdate().numbers_written());
 
     {
       v8::HandleScope inner_scope_2;
-      v8::Local<v8::String> string2 = v8_str("string2");
+      v8_str("string2");
 
       uint32_t entries_size;
       {
         v8::HandleScope inner_scope_3;
-        v8::Handle<v8::String> string3 = v8::String::New("string3");
-        v8::Handle<v8::String> string4 = v8::String::New("string4");
+        v8_str("string3");
+        v8_str("string4");
 
         {
           // Single chunk of data with three new entries expected in update.
           TestStatsStream stats_update = GetHeapStatsUpdate();
           CHECK_EQ(1, stats_update.intervals_count());
           CHECK_EQ(3, stats_update.numbers_written());
           CHECK_LT(0, entries_size = stats_update.entries_size());
           CHECK_EQ(3, stats_update.entries_count());
           CHECK_EQ(4, stats_update.first_interval_index());
         }
@@ skipping 742 matching lines @@
   // Dipose the persistent handles in a different order.
   p_AAA.Dispose();
   CHECK_EQ(global_handle_count + 2,
            v8::HeapProfiler::GetPersistentHandleCount());
   p_CCC.Dispose();
   CHECK_EQ(global_handle_count + 1,
            v8::HeapProfiler::GetPersistentHandleCount());
   p_BBB.Dispose();
   CHECK_EQ(global_handle_count, v8::HeapProfiler::GetPersistentHandleCount());
 }