Fix Android build warnings

runtime/vm/heap_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 
 #include "platform/assert.h"
 #include "vm/dart_api_impl.h"
 #include "vm/globals.h"
 #include "vm/heap.h"
@@ skipping 41 matching lines @@
 
 
 class ClassHeapStatsTestHelper {
  public:
   static ClassHeapStats* GetHeapStatsForCid(ClassTable* class_table,
                                             intptr_t cid) {
     return class_table->StatsAt(cid);
   }
 
   static void DumpClassHeapStats(ClassHeapStats* stats) {
-    printf("%" Pd " ", stats->recent.new_count);
-    printf("%" Pd " ", stats->post_gc.new_count);
-    printf("%" Pd " ", stats->pre_gc.new_count);
-    printf("\n");
+    OS::Print("%" Pd " ", stats->recent.new_count);
+    OS::Print("%" Pd " ", stats->post_gc.new_count);
+    OS::Print("%" Pd " ", stats->pre_gc.new_count);
+    OS::Print("\n");
   }
 };
 
 
 static RawClass* GetClass(const Library& lib, const char* name) {
   const Class& cls = Class::Handle(
       lib.LookupClass(String::Handle(Symbols::New(name))));
   EXPECT(!cls.IsNull());  // No ambiguity error expected.
   return cls.raw();
 }
@@ skipping 126 matching lines @@
     }
   }
   {
     NoGCScope no_gc;
     FindNothing find_nothing;
     EXPECT(Object::null() == heap->FindObject(&find_nothing));
   }
 }
 
 }  // namespace dart.