SF: Moving EventThread::Connection out of impl class

This is part of Scheduler refactoring. EventThread::Connection should be
a wrapper that translates IDisplayEventConnection into EventThread calls.

Test: SF tests pass.
Bug: 113612090
Change-Id: I2bcf0c45a33638c59f7828085c563dbc52b2d66e
diff --git a/services/surfaceflinger/tests/unittests/EventThreadTest.cpp b/services/surfaceflinger/tests/unittests/EventThreadTest.cpp
index fb3b7a2..acbed51 100644
--- a/services/surfaceflinger/tests/unittests/EventThreadTest.cpp
+++ b/services/surfaceflinger/tests/unittests/EventThreadTest.cpp
@@ -47,10 +47,10 @@
 
 class EventThreadTest : public testing::Test {
 protected:
-    class MockEventThreadConnection : public android::impl::EventThread::Connection {
+    class MockEventThreadConnection : public android::EventThreadConnection {
     public:
         explicit MockEventThreadConnection(android::impl::EventThread* eventThread)
-              : android::impl::EventThread::Connection(eventThread) {}
+              : android::EventThreadConnection(eventThread) {}
         MOCK_METHOD1(postEvent, status_t(const DisplayEventReceiver::Event& event));
     };