Rename vars and functions from 'glslcaps'->'shadercaps'

Change-Id: I34d226d866dd4ba8e5f33f95cb8cbf01292f9314
Reviewed-on: https://skia-review.googlesource.com/5312
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/instanced/GLInstancedRendering.cpp b/src/gpu/instanced/GLInstancedRendering.cpp
index 7503204..49b059d 100644
--- a/src/gpu/instanced/GLInstancedRendering.cpp
+++ b/src/gpu/instanced/GLInstancedRendering.cpp
@@ -38,7 +38,7 @@
         (!glCaps.drawIndirectSupport() && !glCaps.drawInstancedSupport())) {
         return GrCaps::InstancedSupport::kNone;
     }
-    return InstanceProcessor::CheckSupport(*glCaps.glslCaps(), glCaps);
+    return InstanceProcessor::CheckSupport(*glCaps.shaderCaps(), glCaps);
 }
 
 GLInstancedRendering::GLInstancedRendering(GrGLGpu* gpu)