Remove support for GL discards

src/gpu/vk/GrVkSampler.cpp

Index: src/gpu/vk/GrVkSampler.cpp
diff --git a/src/gpu/vk/GrVkSampler.cpp b/src/gpu/vk/GrVkSampler.cpp
index 87d569a07cab696dac0cd0141bea2749b6b03280..cd41fd0f3ef6e2fb70b59390cd58fbab59175b0c 100644
--- a/src/gpu/vk/GrVkSampler.cpp
+++ b/src/gpu/vk/GrVkSampler.cpp
@@ -23,7 +23,7 @@ static inline VkSamplerAddressMode tile_to_vk_sampler_address(SkShader::TileMode
     return gWrapModes[tm];
 }
 
-GrVkSampler* GrVkSampler::Create(const GrVkGpu* gpu, const GrTextureParams& params, 
+GrVkSampler* GrVkSampler::Create(const GrVkGpu* gpu, const GrTextureParams& params,
                                  uint32_t mipLevels) {
 
     static VkFilter vkMinFilterModes[] = {