Mojo: Move public C system header files to mojo/public/c/system/.

mojo/public/c/system/macros.h

 // Copyright 2013 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_SYSTEM_MACROS_H_
-#define MOJO_PUBLIC_SYSTEM_MACROS_H_
+#ifndef MOJO_PUBLIC_C_SYSTEM_MACROS_H_
+#define MOJO_PUBLIC_C_SYSTEM_MACROS_H_
 
 #include <stddef.h>
 
 // Annotate a variable indicating it's okay if it's unused.
 // Use like:
 //   int x MOJO_ALLOW_UNUSED = ...;
 #if defined(__GNUC__)
 #define MOJO_ALLOW_UNUSED __attribute__((unused))
 #else
 #define MOJO_ALLOW_UNUSED
 #endif
 
 // Annotate a function indicating that the caller must examine the return value.
 // Use like:
 //   int foo() MOJO_WARN_UNUSED_RESULT;
 // Note that it can only be used on the prototype, and not the definition.
 #if defined(__GNUC__)
 #define MOJO_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
 #else
 #define MOJO_WARN_UNUSED_RESULT
 #endif
 
 // C++-only macros -------------------------------------------------------------
 
 #ifdef __cplusplus

[darin (slow to review), 2014/03/26 18:07:20]

I guess we can just have a cpp/system/macros_cpp.h?

 
 // Annotate a virtual method indicating it must be overriding a virtual method
 // in the parent class. Use like:
 //   virtual void foo() OVERRIDE;
 #if defined(_MSC_VER) || defined(__clang__)
 #define MOJO_OVERRIDE override
 #else
 #define MOJO_OVERRIDE
 #endif
 
@@ skipping 31 matching lines @@
   type(type&); \
   void operator=(type&); \
  public: \
   operator rvalue_type() { return rvalue_type(this); } \
   type Pass() { return type(rvalue_type(this)); } \
   typedef void MoveOnlyTypeForCPP03; \
  private:
 
 #endif  // __cplusplus
 
-#endif  // MOJO_PUBLIC_SYSTEM_MACROS_H_
+#endif  // MOJO_PUBLIC_C_SYSTEM_MACROS_H_