Removes aura dependencies from WindowPositioner

ash/test/ash_test_helper.cc

Index: ash/test/ash_test_helper.cc
diff --git a/ash/test/ash_test_helper.cc b/ash/test/ash_test_helper.cc
index 4ed02de68a148469fa36472fa58a0ff4a378ce8c..1e73995ae48aaee476aea98d7105c297a90a0ebe 100644
--- a/ash/test/ash_test_helper.cc
+++ b/ash/test/ash_test_helper.cc
@@ -118,7 +118,7 @@ void AshTestHelper::SetUp(bool start_session) {
 
   // Reset the global state for the cursor manager. This includes the
   // last cursor visibility state, etc.
-  wm::CursorManager::ResetCursorVisibilityStateForTest();
+  ::wm::CursorManager::ResetCursorVisibilityStateForTest();
 
   // ContentTestSuiteBase might have already initialized
   // MaterialDesignController in unit_tests suite.
@@ -176,7 +176,7 @@ void AshTestHelper::TearDown() {
   ui::ShutdownInputMethodForTesting();
   zero_duration_mode_.reset();
 
-  CHECK(!wm::ScopedCaptureClient::IsActive());
+  CHECK(!::wm::ScopedCaptureClient::IsActive());
 
   views_delegate_.reset();
 }