Remove unused fields from //content.

content/browser/presentation/presentation_service_impl_unittest.cc

Index: content/browser/presentation/presentation_service_impl_unittest.cc
diff --git a/content/browser/presentation/presentation_service_impl_unittest.cc b/content/browser/presentation/presentation_service_impl_unittest.cc
index 172e8b5b80add55ea59dc6ec806d0aa80d1f7582..e1a2b356d6387fbb98971c9d764eec186f1b66fa 100644
--- a/content/browser/presentation/presentation_service_impl_unittest.cc
+++ b/content/browser/presentation/presentation_service_impl_unittest.cc
@@ -192,7 +192,7 @@ class MockPresentationServiceClient : public mojom::PresentationServiceClient {
 
 class PresentationServiceImplTest : public RenderViewHostImplTestHarness {
  public:
-  PresentationServiceImplTest() : default_session_started_count_(0) {}
+  PresentationServiceImplTest() {}
 
   void SetUp() override {
     RenderViewHostImplTestHarness::SetUp();
@@ -366,7 +366,6 @@ class PresentationServiceImplTest : public RenderViewHostImplTestHarness {
       client_binding_;
 
   base::Closure run_loop_quit_closure_;
-  int default_session_started_count_;
 };
 
 TEST_F(PresentationServiceImplTest, ListenForScreenAvailability) {