Update ReplaceIllegalCharactersInPath to handle quirks in HFS+ and VFS

content/browser/download/save_package_unittest.cc

Index: content/browser/download/save_package_unittest.cc
diff --git a/content/browser/download/save_package_unittest.cc b/content/browser/download/save_package_unittest.cc
index c0dcbf0a7ebefc9d519f46e8193d968635c0929c..c6c862c4e7549ea2dd5bdd2e6f630553bc17df8c 100644
--- a/content/browser/download/save_package_unittest.cc
+++ b/content/browser/download/save_package_unittest.cc
@@ -382,7 +382,7 @@ static const struct SuggestedSaveNameTestCase {
   // A URL-like title that does not match the title is respected in full.
   { "http://foo.com",
     base::ASCIIToUTF16("http://www.foo.com/path/title.txt"),
-    FPL("http   www.foo.com path title.txt"),
+    FPL("http___www.foo.com_path_title.txt"),
     false
   },
 };