Merge GrGLSLShaderVar and GrShaderVar

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=5087

Change-Id: Ib8943a1da1ea495554feaf5b0992b94fbb9539ab
Reviewed-on: https://skia-review.googlesource.com/5087
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
diff --git a/src/gpu/vk/GrVkVaryingHandler.cpp b/src/gpu/vk/GrVkVaryingHandler.cpp
index 099e096..2b3e975 100644
--- a/src/gpu/vk/GrVkVaryingHandler.cpp
+++ b/src/gpu/vk/GrVkVaryingHandler.cpp
@@ -55,7 +55,7 @@
 void finalize_helper(GrVkVaryingHandler::VarArray& vars) {
     int locationIndex = 0;
     for (int i = 0; i < vars.count(); ++i) {
-        GrGLSLShaderVar& var = vars[i];
+        GrShaderVar& var = vars[i];
         SkString location;
         location.appendf("location = %d", locationIndex);
         var.setLayoutQualifier(location.c_str());