Blimp: change logger to use switch/case for types.

blimp/client/feature/render_widget_feature.cc

Index: blimp/client/feature/render_widget_feature.cc
diff --git a/blimp/client/feature/render_widget_feature.cc b/blimp/client/feature/render_widget_feature.cc
index 6019cf738d0ba1b6bff43cbdedd7f8f51bc516fc..79748cd2d281ef23a2f82f14ba41ff67c9cea8c4 100644
--- a/blimp/client/feature/render_widget_feature.cc
+++ b/blimp/client/feature/render_widget_feature.cc
@@ -100,6 +100,7 @@ void RenderWidgetFeature::ProcessMessage(
       break;
     default:
       NOTREACHED();
+      break;
   }
 
   callback.Run(net::OK);
@@ -120,6 +121,9 @@ void RenderWidgetFeature::ProcessRenderWidgetMessage(
     case RenderWidgetMessage::DELETED:
       delegate->OnRenderWidgetDeleted(render_widget_id);
       break;
+    case RenderWidgetMessage::UNKNOWN:
+      NOTREACHED();
+      break;
   }
 }