Re-try r29078: Remove some deprecated file_util wstring functions.

chrome_frame/test/perf/chrome_frame_perftest.cc

Index: chrome_frame/test/perf/chrome_frame_perftest.cc
===================================================================
--- chrome_frame/test/perf/chrome_frame_perftest.cc	(revision 29088)
+++ chrome_frame/test/perf/chrome_frame_perftest.cc	(working copy)
@@ -621,7 +621,8 @@
     file_util::AppendToPath(&chrome_exe_test_path,
                             chrome::kBrowserProcessExecutableName);
 
-    if (!file_util::PathExists(chrome_exe_test_path)) {
+    if (!file_util::PathExists(
+        FilePath::FromWStringHack(chrome_exe_test_path))) {
       file_util::UpOneDirectory(&chrome_exe_path);
 
       chrome_exe_test_path = chrome_exe_path;
@@ -629,7 +630,8 @@
                               chrome::kBrowserProcessExecutableName);
     }
 
-    EXPECT_TRUE(file_util::PathExists(chrome_exe_test_path));
+    EXPECT_TRUE(
+        file_util::PathExists(FilePath::FromWStringHack(chrome_exe_test_path)));
 
     return chrome_exe_path;
   }