Enable MD by default on Windows for Canary/Dev and local builds.

ui/base/test/material_design_controller_test_api.cc

Index: ui/base/test/material_design_controller_test_api.cc
diff --git a/ui/base/test/material_design_controller_test_api.cc b/ui/base/test/material_design_controller_test_api.cc
index 029af51adc321a48727605588c4a8a7d1696e39e..edfcea3fe28549a1b6082b1791a8f74047883174 100644
--- a/ui/base/test/material_design_controller_test_api.cc
+++ b/ui/base/test/material_design_controller_test_api.cc
@@ -19,9 +19,15 @@ MaterialDesignControllerTestAPI::~MaterialDesignControllerTestAPI() {
   MaterialDesignController::mode_ = previous_mode_;
 }
 
+// static
 void MaterialDesignControllerTestAPI::Uninitialize() {
   MaterialDesignController::Uninitialize();
 }
 
+// static
+MaterialDesignController::Mode MaterialDesignControllerTestAPI::DefaultMode() {
+  return MaterialDesignController::DefaultMode();
+}
+
 }  // namespace test
 }  // namespace ui