Stop trying to use the italic version of the system font; it doesn't exist.

With recent changes to ui::gfx::Font, attempting to actually draw non-existent font styles crashes.

BUG=171518,314577
TEST=no crashes as in bug 314577
NOTRY=true

Review URL: https://codereview.chromium.org/58503002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233072 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/autofill/autofill_popup_controller_impl.cc

@@ -113,8 +113,13 @@ AutofillPopupControllerImpl::AutofillPopupControllerImpl(
   ClearState();
 #if !defined(OS_ANDROID)
   subtext_font_ = name_font_.DeriveFont(kLabelFontSizeDelta);
+#if defined(OS_MACOSX)
+  // There is no italic version of the system font.
+  warning_font_ = name_font_;
+#else
   warning_font_ = name_font_.DeriveFont(0, gfx::Font::ITALIC);
 #endif
+#endif
 }
 
 AutofillPopupControllerImpl::~AutofillPopupControllerImpl() {}