Move validation of ANGLE_instanced_arrays to the validation layer.

BUG=angle:520

Change-Id: Idb3c50235a7029e72c58bc202aba0cfab735202a
Reviewed-on: https://chromium-review.googlesource.com/218510
Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>
diff --git a/src/libGLESv2/libGLESv2.cpp b/src/libGLESv2/libGLESv2.cpp
index d41d2c2..d373c0c 100644
--- a/src/libGLESv2/libGLESv2.cpp
+++ b/src/libGLESv2/libGLESv2.cpp
@@ -1365,7 +1365,7 @@
     gl::Context *context = gl::getNonLostContext();
     if (context)
     {
-        if (!ValidateDrawArraysInstanced(context, mode, first, count, primcount))
+        if (!ValidateDrawArraysInstancedANGLE(context, mode, first, count, primcount))
         {
             return;
         }
@@ -1401,7 +1401,7 @@
     if (context)
     {
         rx::RangeUI indexRange;
-        if (!ValidateDrawElementsInstanced(context, mode, count, type, indices, primcount, &indexRange))
+        if (!ValidateDrawElementsInstancedANGLE(context, mode, count, type, indices, primcount, &indexRange))
         {
             return;
         }