Prettify output from chrome.fileSystem.getDisplayPath for POSIX profile directories

chrome/browser/extensions/api/file_system/file_system_api.cc

Index: chrome/browser/extensions/api/file_system/file_system_api.cc
diff --git a/chrome/browser/extensions/api/file_system/file_system_api.cc b/chrome/browser/extensions/api/file_system/file_system_api.cc
index c3c71250251315d4ac4dcef171458bd5ac568ac0..eb20c11c664c083d42ddf839fe2100ff43944ae2 100644
--- a/chrome/browser/extensions/api/file_system/file_system_api.cc
+++ b/chrome/browser/extensions/api/file_system/file_system_api.cc
@@ -51,19 +51,14 @@ struct RewritePair {
 const RewritePair g_rewrite_pairs[] = {
 #if defined(OS_WIN)
   {base::DIR_PROFILE, "~"},
+#elif defined(OS_POSIX)
+  {base::DIR_HOME, "~"},
 #endif
 };
 
 FilePath PrettifyPath(const FilePath& file_path) {
-  // Note that when g_rewrite_pairs includes at least one value on all
-  // platforms, this code can be cleaned up.
-#if defined(OS_WIN)
-  size_t size = arraysize(g_rewrite_pairs);
-#else
-  size_t size = 0;
-#endif
-
-  for (size_t i = 0; i < size; ++i) {
+#if defined(OS_WIN) || defined(OS_POSIX)
+  for (size_t i = 0; i < arraysize(g_rewrite_pairs); ++i) {
     FilePath candidate_path;
     if (!PathService::Get(g_rewrite_pairs[i].path_key, &candidate_path))
       continue;  // We don't DCHECK this value, as Get will return false even
@@ -77,6 +72,7 @@ FilePath PrettifyPath(const FilePath& file_path) {
       return output;
     }
   }
+#endif
 
   return file_path;
 }