remove dead code not mentioned in any GYP

src/gpu/GrCommandBuilder.cpp

Index: src/gpu/GrCommandBuilder.cpp
diff --git a/src/gpu/GrCommandBuilder.cpp b/src/gpu/GrCommandBuilder.cpp
deleted file mode 100644
index abc695499075c53e3893be2e09cc50c49185090a..0000000000000000000000000000000000000000
--- a/src/gpu/GrCommandBuilder.cpp
+++ /dev/null
@@ -1,19 +0,0 @@
-/*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "GrCommandBuilder.h"
-
-#include "GrInOrderCommandBuilder.h"
-#include "GrReorderCommandBuilder.h"
-
-GrCommandBuilder* GrCommandBuilder::Create(GrGpu* gpu, bool reorder) {
-    if (reorder) {
-        return new GrReorderCommandBuilder;
-    } else {
-        return new GrInOrderCommandBuilder;
-    }
-}