Various fixes in VulkanWindowContext

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4066

Change-Id: Ib42dbe70e868c83bdf06e370388e0cc7639a0992
Reviewed-on: https://skia-review.googlesource.com/4066
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
diff --git a/tools/viewer/sk_app/VulkanWindowContext.h b/tools/viewer/sk_app/VulkanWindowContext.h
index abb8730..c1ed871 100644
--- a/tools/viewer/sk_app/VulkanWindowContext.h
+++ b/tools/viewer/sk_app/VulkanWindowContext.h
@@ -36,8 +36,8 @@
         this->createSwapchain(fWidth, fHeight, params);
     }
 
-    GrBackendContext getBackendContext() override { 
-        return (GrBackendContext) fBackendContext.get(); 
+    GrBackendContext getBackendContext() override {
+        return (GrBackendContext) fBackendContext.get();
     }
 
     /** Platform specific function that creates a VkSurfaceKHR for a window */