Deprecate file_util::AppendToPath() on non-Windows.

base/file_util.cc

Index: base/file_util.cc
diff --git a/base/file_util.cc b/base/file_util.cc
index e0e677251b24f54958d1a61626ddfd9ea0000927..b10cd0b2229418a587ec2f61d9836f21025ffa73 100644
--- a/base/file_util.cc
+++ b/base/file_util.cc
@@ -331,16 +331,21 @@ bool AbsolutePath(std::wstring* path_str) {
   *path_str = path.ToWStringHack();
   return true;
 }
+
+#if defined(OS_WIN)
+// This function is deprecated; see file_util_deprecated.h for details.
 void AppendToPath(std::wstring* path, const std::wstring& new_ending) {
   if (!path) {
     NOTREACHED();
     return;  // Don't crash in this function in release builds.
   }
 
-  if (!EndsWithSeparator(path))
+  if (!EndsWithSeparator(*path))
     path->push_back(FilePath::kSeparators[0]);
   path->append(new_ending);
 }
+#endif
+
 bool CopyDirectory(const std::wstring& from_path, const std::wstring& to_path,
                    bool recursive) {
   return CopyDirectory(FilePath::FromWStringHack(from_path),
@@ -350,9 +355,6 @@ bool CopyDirectory(const std::wstring& from_path, const std::wstring& to_path,
 bool Delete(const std::wstring& path, bool recursive) {
   return Delete(FilePath::FromWStringHack(path), recursive);
 }
-bool EndsWithSeparator(std::wstring* path) {
-  return EndsWithSeparator(FilePath::FromWStringHack(*path));
-}
 bool EndsWithSeparator(const std::wstring& path) {
   return EndsWithSeparator(FilePath::FromWStringHack(path));
 }