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

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

Index: mojo/public/c/include/mojo/bindings/buffer.h
diff --git a/mojo/public/c/bindings/buffer.h b/mojo/public/c/include/mojo/bindings/buffer.h
similarity index 91%
rename from mojo/public/c/bindings/buffer.h
rename to mojo/public/c/include/mojo/bindings/buffer.h
index ace1b02bd586fb50daa623c252e75a989a410c32..8df8449a1a39c3eed3acdfeff904bba29d7d20da 100644
--- a/mojo/public/c/bindings/buffer.h
+++ b/mojo/public/c/include/mojo/bindings/buffer.h
@@ -2,8 +2,8 @@
 // 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>
@@ -45,4 +45,4 @@ struct MojomHandleBuffer {
 
 MOJO_END_EXTERN_C
 
-#endif  // MOJO_PUBLIC_C_BINDINGS_BUFFER_H_
+#endif  // MOJO_PUBLIC_C_INCLUDE_MOJO_BINDINGS_BUFFER_H_