Change the canonical way to include the C bindings headers to <mojo/bindings/*.h>.

mojo/public/c/include/mojo/bindings/buffer.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef MOJO_PUBLIC_C_BINDINGS_BUFFER_H_
-#define MOJO_PUBLIC_C_BINDINGS_BUFFER_H_
+#ifndef MOJO_PUBLIC_C_INCLUDE_MOJO_BINDINGS_BUFFER_H_
+#define MOJO_PUBLIC_C_INCLUDE_MOJO_BINDINGS_BUFFER_H_
 
 #include <mojo/macros.h>
 #include <mojo/system/handle.h>
 #include <stdint.h>
 
 MOJO_BEGIN_EXTERN_C
 
 // |MojomBuffer| is used to track a buffer state for mojom serialization. The
 // user must initialize this struct themselves. See the fields for details.
 struct MojomBuffer {
@@ skipping 21 matching lines @@
   uint32_t num_handles;
   // The number of handles used so far in |handles|. As handles are moved into
   // |handles|, this counter is incremented. The caller can use it to determine
   // how many handles were moved into |handles| after serialization. This
   // counter must be initialized appropriately before the struct can be used.
   uint32_t num_handles_used;
 };
 
 MOJO_END_EXTERN_C
 
-#endif  // MOJO_PUBLIC_C_BINDINGS_BUFFER_H_
+#endif  // MOJO_PUBLIC_C_INCLUDE_MOJO_BINDINGS_BUFFER_H_