Move SkMessageBus::Get out of header, and retry crrev.com/106563002.

BUG=
R=bsalomon@google.com, kkinnunen@nvidia.com

Author: mtklein@google.com

Review URL: https://codereview.chromium.org/140053002

git-svn-id: http://skia.googlecode.com/svn/trunk@13104 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/MessageBusTest.cpp b/tests/MessageBusTest.cpp
index 0e40d12..f7a02b2 100644
--- a/tests/MessageBusTest.cpp
+++ b/tests/MessageBusTest.cpp
@@ -8,14 +8,11 @@
 #include "SkMessageBus.h"
 #include "Test.h"
 
-namespace {
-
 struct TestMessage {
     int x;
     float y;
 };
-
-}  // namespace
+DECLARE_SKMESSAGEBUS_MESSAGE(TestMessage)
 
 DEF_TEST(MessageBus, r) {
     // Register two inboxes to receive all TestMessages.