Vulkan: Use custom volk init function.

This should ensure we're using ANGLE's version of the loader.

Bug: chromium:1235314
Change-Id: Ia7318a922e192ce669a8cece070ab518ea421fd5
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3067511
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
diff --git a/src/libANGLE/renderer/vulkan/RendererVk.cpp b/src/libANGLE/renderer/vulkan/RendererVk.cpp
index 083fb3f..a183c06 100644
--- a/src/libANGLE/renderer/vulkan/RendererVk.cpp
+++ b/src/libANGLE/renderer/vulkan/RendererVk.cpp
@@ -846,7 +846,7 @@
     mLibVulkanLibrary->getAs("vkGetInstanceProcAddr", &vulkanLoaderGetInstanceProcAddr);
 
     // Set all vk* function ptrs
-    ANGLE_VK_TRY(displayVk, volkInitialize());
+    volkInitializeCustom(vulkanLoaderGetInstanceProcAddr);
 
     uint32_t ver = volkGetInstanceVersion();
     if (!IsAndroid() && VK_API_VERSION_MAJOR(ver) == 1 &&