Make SharedMemoryHandle a class on windows.

sandbox/win/src/handle_inheritance_test.cc

Index: sandbox/win/src/handle_inheritance_test.cc
diff --git a/sandbox/win/src/handle_inheritance_test.cc b/sandbox/win/src/handle_inheritance_test.cc
index 95a369a4dc171a642c26bd33f08ea157c3beef3a..1a411b543b41388c7b5698b968f0583bf72b3322 100644
--- a/sandbox/win/src/handle_inheritance_test.cc
+++ b/sandbox/win/src/handle_inheritance_test.cc
@@ -56,7 +56,7 @@ SBOX_TESTS_COMMAND int
 HandleInheritanceTests_ValidInheritedHandle(int argc, wchar_t **argv) {
   if (argc != 1)
     return SBOX_TEST_FAILED_TO_RUN_TEST;
-  base::SharedMemoryHandle handle = nullptr;
+  HANDLE handle = nullptr;
   base::StringToUint(argv[0], reinterpret_cast<unsigned int *>(&handle));
 
   // This handle we inherited must be both valid and closeable.
@@ -79,8 +79,8 @@ TEST(HandleInheritanceTests, InheritByValue) {
   ASSERT_TRUE(test_shared_memory.Map(0));
 
   TestRunner runner;
-  void *shared_handle =
-      runner.GetPolicy()->AddHandleToShare(test_shared_memory.handle());
+  void* shared_handle = runner.GetPolicy()->AddHandleToShare(
+      test_shared_memory.handle().GetHandle());
 
   std::string command_line =
       "HandleInheritanceTests_ValidInheritedHandle " +