Make the shmem-specific functions in file_util.h POSIX-only.

base/file_util.h

Index: base/file_util.h
diff --git a/base/file_util.h b/base/file_util.h
index b86d8cb74640e8df6db328cf74942d6c520da43c..9646c76e5265d2ebd3c905d20e3c4b4cfae290ec 100644
--- a/base/file_util.h
+++ b/base/file_util.h
@@ -211,15 +211,6 @@ BASE_EXPORT bool IsDirectoryEmpty(const FilePath& dir_path);
 // they're open (which can lead to security issues).
 BASE_EXPORT bool GetTempDir(FilePath* path);
 
-// Get a temporary directory for shared memory files. The directory may depend
-// on whether the destination is intended for executable files, which in turn
-// depends on how /dev/shmem was mounted. As a result, you must supply whether
-// you intend to create executable shmem segments so this function can find
-// an appropriate location.
-//
-// Only useful on POSIX; redirects to GetTempDir() on Windows.
-BASE_EXPORT bool GetShmemTempDir(bool executable, FilePath* path);
-
 // Get the home directory. This is more complicated than just getenv("HOME")
 // as it knows to fall back on getpwent() etc.
 //
@@ -241,12 +232,6 @@ BASE_EXPORT bool CreateTemporaryFileInDir(const FilePath& dir,
 // Returns a handle to the opened file or NULL if an error occurred.
 BASE_EXPORT FILE* CreateAndOpenTemporaryFile(FilePath* path);
 
-// Like above but for shmem files.  Only useful for POSIX.
-// The executable flag says the file needs to support using
-// mprotect with PROT_EXEC after mapping.
-BASE_EXPORT FILE* CreateAndOpenTemporaryShmemFile(FilePath* path,
-                                                  bool executable);
-
 // Similar to CreateAndOpenTemporaryFile, but the file is created in |dir|.
 BASE_EXPORT FILE* CreateAndOpenTemporaryFileInDir(const FilePath& dir,
                                                   FilePath* path);
@@ -409,6 +394,21 @@ enum FileSystemType {
 BASE_EXPORT bool GetFileSystemType(const FilePath& path, FileSystemType* type);
 #endif
 
+#if defined(OS_POSIX)
+// Get a temporary directory for shared memory files. The directory may depend
+// on whether the destination is intended for executable files, which in turn
+// depends on how /dev/shmem was mounted. As a result, you must supply whether
+// you intend to create executable shmem segments so this function can find
+// an appropriate location.
+BASE_EXPORT bool GetShmemTempDir(bool executable, FilePath* path);
+
+// Like above but for shmem files.  Only useful for POSIX.
+// The executable flag says the file needs to support using
+// mprotect with PROT_EXEC after mapping.
+BASE_EXPORT FILE* CreateAndOpenTemporaryShmemFile(FilePath* path,
+                                                  bool executable);
+#endif
+
 }  // namespace base
 
 // -----------------------------------------------------------------------------