Rename VertexArrayImpl::mData to mState.

Refactoring change only.

BUG=angleproject:1898

Change-Id: I9f55651f923ff930c395a9bb575b4f86ad5d9cbd
Reviewed-on: https://chromium-review.googlesource.com/707689
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
diff --git a/src/libANGLE/renderer/vulkan/VertexArrayVk.cpp b/src/libANGLE/renderer/vulkan/VertexArrayVk.cpp
index c00cb36..5d5497a 100644
--- a/src/libANGLE/renderer/vulkan/VertexArrayVk.cpp
+++ b/src/libANGLE/renderer/vulkan/VertexArrayVk.cpp
@@ -17,7 +17,7 @@
 namespace rx
 {
 
-VertexArrayVk::VertexArrayVk(const gl::VertexArrayState &data) : VertexArrayImpl(data)
+VertexArrayVk::VertexArrayVk(const gl::VertexArrayState &state) : VertexArrayImpl(state)
 {
 }