Promotes a handful of members from WmShell to Shell

ash/common/devtools/ash_devtools_unittest.cc

Index: ash/common/devtools/ash_devtools_unittest.cc
diff --git a/ash/common/devtools/ash_devtools_unittest.cc b/ash/common/devtools/ash_devtools_unittest.cc
index 7c96bff0d02a0e837a26d7d776bcfac1d477d3ba..865195997c97a67c82c87ba20e538133bcf4cd4a 100644
--- a/ash/common/devtools/ash_devtools_unittest.cc
+++ b/ash/common/devtools/ash_devtools_unittest.cc
@@ -199,8 +199,7 @@ class AshDevToolsTest : public AshTest {
     fake_frontend_channel_ = base::MakeUnique<FakeFrontendChannel>();
     uber_dispatcher_ =
         base::MakeUnique<UberDispatcher>(fake_frontend_channel_.get());
-    dom_agent_ =
-        base::MakeUnique<devtools::AshDevToolsDOMAgent>(WmShell::Get());
+    dom_agent_ = base::MakeUnique<devtools::AshDevToolsDOMAgent>();
     dom_agent_->Init(uber_dispatcher_.get());
     css_agent_ =
         base::MakeUnique<devtools::AshDevToolsCSSAgent>(dom_agent_.get());