Remove cc:LayerTreeHostImpl::IsContextLost.

cc/trees/layer_tree_host_impl_unittest.cc

Index: cc/trees/layer_tree_host_impl_unittest.cc
diff --git a/cc/trees/layer_tree_host_impl_unittest.cc b/cc/trees/layer_tree_host_impl_unittest.cc
index fa301937b5564c47127e0aedcc3d2b793b24c7f0..9cb96c4610b81372361a6b98b8b06728ca5bbaad 100644
--- a/cc/trees/layer_tree_host_impl_unittest.cc
+++ b/cc/trees/layer_tree_host_impl_unittest.cc
@@ -6974,23 +6974,14 @@ class LayerTreeHostImplCountingLostSurfaces : public LayerTreeHostImplTest {
 };
 
 TEST_F(LayerTreeHostImplCountingLostSurfaces, TwiceLostSurface) {
-  // The medium term, we plan to remove LayerTreeHostImpl::IsContextLost().
-  // Until then, we need the state variable
-  // LayerTreeHostImpl::have_valid_output_surface_ and we can
-  // enforce the following behaviour, where calling DidLoseOutputSurface
-  // twice in a row only causes one subsequent
-  // call to LayerTreeHostImplClient::DidLoseOutputSurfaceOnImplThread().
   // Really we just need at least one client notification each time
   // we go from having a valid output surface to not having a valid output
   // surface.
   EXPECT_EQ(0, num_lost_surfaces_);
-  EXPECT_FALSE(host_impl_->IsContextLost());
   host_impl_->DidLoseOutputSurface();
-  EXPECT_TRUE(host_impl_->IsContextLost());
   EXPECT_EQ(1, num_lost_surfaces_);
   host_impl_->DidLoseOutputSurface();
-  EXPECT_TRUE(host_impl_->IsContextLost());
-  EXPECT_EQ(1, num_lost_surfaces_);
+  EXPECT_LE(1, num_lost_surfaces_);
 }
 
 }  // namespace