Unify DescriptorPools for vulkan uniform descriptor sets

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1927943002

Review-Url: https://codereview.chromium.org/1927943002
diff --git a/src/gpu/vk/GrVkDescriptorPool.h b/src/gpu/vk/GrVkDescriptorPool.h
index bb5697c..8fcc670 100644
--- a/src/gpu/vk/GrVkDescriptorPool.h
+++ b/src/gpu/vk/GrVkDescriptorPool.h
@@ -21,7 +21,7 @@
  */
 class GrVkDescriptorPool : public GrVkResource {
 public:
-    explicit GrVkDescriptorPool(const GrVkGpu* gpu, VkDescriptorType type, uint32_t count);
+    GrVkDescriptorPool(const GrVkGpu* gpu, VkDescriptorType type, uint32_t count);
 
     VkDescriptorPool descPool() const { return fDescPool; }