Oilpan: DOM wrappers don't need to keep persistent handles

Source/platform/heap/blink_heap.gypi

 #
 # Copyright (C) 2013 Google Inc. 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
@@ skipping 16 matching lines @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #
 
 {
   'variables': {
     'platform_heap_files': [
       'AddressSanitizer.h',
       'CallbackStack.cpp',
       'CallbackStack.h',
-      'Handle.cpp',
       'Handle.h',
       'Heap.cpp',
       'Heap.h',
       'ThreadState.cpp',
       'ThreadState.h',
       'Visitor.cpp',
       'Visitor.h',
     ],
     'platform_heap_test_files': [
       'HeapTest.cpp',
@@ skipping 20 matching lines @@
         ],
       }],
       ['target_arch == "ia32" or target_arch == "x64"', {
         'platform_heap_asm_files': [
           'asm/SaveRegisters_x86.asm',
         ],
       }],
     ],
   },
 }