Rename gl::Data to gl::ContextState.

Part of the new world order of renaming the Obj::Data classes to ObjState.

BUG=angleproject:1363

Change-Id: I15cf002b8b093d687f540b9e86f045874af24a7e
Reviewed-on: https://chromium-review.googlesource.com/340740
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
diff --git a/src/libANGLE/renderer/gl/ProgramGL.cpp b/src/libANGLE/renderer/gl/ProgramGL.cpp
index f5d3a48..9aaae63 100644
--- a/src/libANGLE/renderer/gl/ProgramGL.cpp
+++ b/src/libANGLE/renderer/gl/ProgramGL.cpp
@@ -92,7 +92,7 @@
     }
 }
 
-LinkResult ProgramGL::link(const gl::Data &data, gl::InfoLog &infoLog)
+LinkResult ProgramGL::link(const gl::ContextState &data, gl::InfoLog &infoLog)
 {
     preLink();