Fix wide/ASCII conversion for CrOS testing.

chrome/test/pyautolib/pyautolib.cc

Index: chrome/test/pyautolib/pyautolib.cc
diff --git a/chrome/test/pyautolib/pyautolib.cc b/chrome/test/pyautolib/pyautolib.cc
index 52bf72628918a9aa06f46c1317372c0c17abeec2..ae12e2fd440c2658f3b4cefc74f3a375c0c4d796 100644
--- a/chrome/test/pyautolib/pyautolib.cc
+++ b/chrome/test/pyautolib/pyautolib.cc
@@ -46,7 +46,7 @@ bool PyUITestSuiteBase::IsBrowserTestSuite() { return true; }
 PyUITestBase::PyUITestBase(bool clear_profile, std::wstring homepage)
     : UITestBase() {
   set_clear_profile(clear_profile);
-  set_homepage(base::UTF16ToASCII(homepage));
+  set_homepage(base::WideToUTF8(homepage));
   // We add this so that pyauto can execute javascript in the renderer and
   // read values back.
   dom_automation_enabled_ = true;