Fix missing file license in HLSLCompiler.h.

src/libANGLE/renderer/d3d/HLSLCompiler.h

+//
+// Copyright (c) 2016 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// HLSLCompiler: Wrapper for the D3DCompiler DLL.
+//
+
 #ifndef LIBANGLE_RENDERER_D3D_HLSLCOMPILER_H_
 #define LIBANGLE_RENDERER_D3D_HLSLCOMPILER_H_
 
@@ -53,4 +61,4 @@ class HLSLCompiler : angle::NonCopyable
 
 }
 
-#endif // LIBANGLE_RENDERER_D3D_HLSLCOMPILER_H_
+#endif  // LIBANGLE_RENDERER_D3D_HLSLCOMPILER_H_