Vulkan: Rename vk::Shared* to vk::RefCounted*

To be specific regarding what being "shared" entails.  Also, avoids
confusion w.r.t to an upcoming vk::Shared class.

Bug: angleproject:2464
Change-Id: Ib9c112bbb822ae30dab39c75a8cde25dd79b2258
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1499693
Reviewed-by: Jamie Madill <jmadill@google.com>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
diff --git a/src/libANGLE/renderer/vulkan/ProgramVk.cpp b/src/libANGLE/renderer/vulkan/ProgramVk.cpp
index e5aece9..3d45a4f 100644
--- a/src/libANGLE/renderer/vulkan/ProgramVk.cpp
+++ b/src/libANGLE/renderer/vulkan/ProgramVk.cpp
@@ -215,7 +215,7 @@
     mDescriptorSets.clear();
     mUsedDescriptorSetRange.invalidate();
 
-    for (vk::SharedDescriptorPoolBinding &binding : mDescriptorPoolBindings)
+    for (vk::RefCountedDescriptorPoolBinding &binding : mDescriptorPoolBindings)
     {
         binding.reset();
     }