[heap] Hide GCTracer inside the heap component.

test/cctest/test-gc-tracer.cc

 // Copyright 2014 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 10 matching lines @@
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <stdlib.h>
 #include <utility>
 
-#include "src/v8.h"
-
+#include "src/heap/gc-tracer.h"
 #include "test/cctest/cctest.h"
 
 using namespace v8::internal;
 
 TEST(RingBufferPartialFill) {
   const int max_size = 6;
   typedef RingBuffer<int, max_size>::const_iterator Iter;
   RingBuffer<int, max_size> ring_buffer;
   CHECK(ring_buffer.empty());
   CHECK_EQ(static_cast<int>(ring_buffer.size()), 0);
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   CHECK(ring_buffer.begin() != ring_buffer.end());
 
   // Test forward iteration
   int i = 14;
   for (Iter iter = ring_buffer.begin(); iter != ring_buffer.end(); ++iter) {
     CHECK(*iter == i);
     --i;
   }
   CHECK_EQ(i, 8);  // one past last element.
 }