Handle JS-created files in <input type="file">.

Source/core/rendering/RenderThemeChromiumMac.mm

Index: Source/core/rendering/RenderThemeChromiumMac.mm
diff --git a/Source/core/rendering/RenderThemeChromiumMac.mm b/Source/core/rendering/RenderThemeChromiumMac.mm
index 5f82697c4658147601de74e0afd61dbf681f2e8a..db5a15b77f6e45f895ca4112eef8fe03a4fc6037 100644
--- a/Source/core/rendering/RenderThemeChromiumMac.mm
+++ b/Source/core/rendering/RenderThemeChromiumMac.mm
@@ -1763,7 +1763,11 @@ String RenderThemeChromiumMac::fileListNameForWidth(Locale& locale, const FileLi
     if (fileList->isEmpty()) {
         strToTruncate = locale.queryString(blink::WebLocalizedString::FileButtonNoFileSelectedLabel);
     } else if (fileList->length() == 1) {
-        strToTruncate = [[NSFileManager defaultManager] displayNameAtPath:(fileList->item(0)->path())];
+        File* file = fileList->item(0);
+        if (file->userVisibility() == File::IsUserVisible)
+            strToTruncate = [[NSFileManager defaultManager] displayNameAtPath:(fileList->item(0)->path())];
+        else
+            strToTruncate = file->name();
     } else {
         // FIXME: Localization of fileList->length().
         return StringTruncator::rightTruncate(locale.queryString(blink::WebLocalizedString::MultipleFileUploadText, String::number(fileList->length())), width, font);