remoting: Cleanup class/struct fwd declarations

remoting/test/chromoting_test_fixture.h

Index: remoting/test/chromoting_test_fixture.h
diff --git a/remoting/test/chromoting_test_fixture.h b/remoting/test/chromoting_test_fixture.h
index 5293815d6954728bd1166e611257bfcdcd828251..cf62ccd64234c3029a3ec7d26850c510306304c5 100644
--- a/remoting/test/chromoting_test_fixture.h
+++ b/remoting/test/chromoting_test_fixture.h
@@ -11,17 +11,11 @@
 #include "base/threading/thread_checker.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-namespace base {
-class RunLoop;
-class Timer;
-}
-
 namespace remoting {
 namespace test {
 
 class ConnectionTimeObserver;
 class TestChromotingClient;
-struct HostInfo;
 
 // Provides chromoting connection capabilities for tests to use. Performance
 // metrics of the established connection are readily available to calculate