Make Dispatcher::Type an enum class.

mojo/edk/system/multiprocess_message_pipe_unittest.cc

Index: mojo/edk/system/multiprocess_message_pipe_unittest.cc
diff --git a/mojo/edk/system/multiprocess_message_pipe_unittest.cc b/mojo/edk/system/multiprocess_message_pipe_unittest.cc
index dcdc500fd184a464f73f6db292ea30ced05bb485..da91c4ecf24013cd2967fa7b24ef99d4b6eafb93 100644
--- a/mojo/edk/system/multiprocess_message_pipe_unittest.cc
+++ b/mojo/edk/system/multiprocess_message_pipe_unittest.cc
@@ -240,7 +240,7 @@ MOJO_MULTIPROCESS_TEST_CHILD_MAIN(CheckSharedBuffer) {
   CHECK_EQ(read_buffer, std::string("go 1"));
   CHECK_EQ(num_dispatchers, 1u);
 
-  CHECK_EQ(dispatchers[0]->GetType(), Dispatcher::kTypeSharedBuffer);
+  CHECK_EQ(dispatchers[0]->GetType(), Dispatcher::Type::SHARED_BUFFER);
 
   scoped_refptr<SharedBufferDispatcher> dispatcher(
       static_cast<SharedBufferDispatcher*>(dispatchers[0].get()));
@@ -424,7 +424,7 @@ MOJO_MULTIPROCESS_TEST_CHILD_MAIN(CheckPlatformHandleFile) {
   CHECK_GT(num_handles, 0);
 
   for (int i = 0; i < num_handles; ++i) {
-    CHECK_EQ(dispatchers[i]->GetType(), Dispatcher::kTypePlatformHandle);
+    CHECK_EQ(dispatchers[i]->GetType(), Dispatcher::Type::PLATFORM_HANDLE);
 
     scoped_refptr<PlatformHandleDispatcher> dispatcher(
         static_cast<PlatformHandleDispatcher*>(dispatchers[i].get()));