[heap] Fix compilation of LargeObjectSpace on Windows.

R=thakis@chromium.org, titzer@chromium.org

Review URL: https://codereview.chromium.org/1288723005 .

Cr-Commit-Position: refs/heads/master@{#30255}

src/heap/spaces.cc

@@ -2814,6 +2814,9 @@ LargeObjectSpace::LargeObjectSpace(Heap* heap, AllocationSpace id)
       chunk_map_(ComparePointers, 1024) {}
 
 
+LargeObjectSpace::~LargeObjectSpace() {}
+
+
 bool LargeObjectSpace::SetUp() {
   first_page_ = NULL;
   size_ = 0;

src/heap/spaces.h

@@ -2702,7 +2702,7 @@ class MapSpace : public PagedSpace {
 class LargeObjectSpace : public Space {
  public:
   LargeObjectSpace(Heap* heap, AllocationSpace id);
-  virtual ~LargeObjectSpace() {}
+  virtual ~LargeObjectSpace();
 
   // Initializes internal data structures.
   bool SetUp();