test_runner: Move everything else into content namespace.

content/test/layouttest_support.cc

Index: content/test/layouttest_support.cc
diff --git a/content/test/layouttest_support.cc b/content/test/layouttest_support.cc
index eb218ab1e8a509cbaec4a95c48003887e7684c51..550da8dc22cb1686955d34a94bc136bff5bc9993 100644
--- a/content/test/layouttest_support.cc
+++ b/content/test/layouttest_support.cc
@@ -193,8 +193,7 @@ std::string DumpHistoryItem(HistoryEntry::HistoryNode* node,
     result.append(indent, ' ');
   }
 
-  std::string url =
-      WebTestRunner::normalizeLayoutTestURL(item.urlString().utf8());
+  std::string url = normalizeLayoutTestURL(item.urlString().utf8());
   result.append(url);
   if (!item.target().isEmpty()) {
     result.append(" (in frame \"");