content: Extract url utility functions into url_utils.{h,cc}

chrome/browser/tab_contents/render_view_context_menu.cc

Index: chrome/browser/tab_contents/render_view_context_menu.cc
diff --git a/chrome/browser/tab_contents/render_view_context_menu.cc b/chrome/browser/tab_contents/render_view_context_menu.cc
index ad04d13ccb11812499cbba15b51456de989ab4a9..cd4265fbcb68dce4095c0354e1b09a25c960a594 100644
--- a/chrome/browser/tab_contents/render_view_context_menu.cc
+++ b/chrome/browser/tab_contents/render_view_context_menu.cc
@@ -79,6 +79,7 @@
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/content_restriction.h"
 #include "content/public/common/ssl_status.h"
+#include "content/public/common/url_utils.h"
 #include "extensions/browser/view_type_utils.h"
 #include "grit/generated_resources.h"
 #include "net/base/escape.h"
@@ -1334,7 +1335,7 @@ bool RenderViewContextMenu::IsCommandIdEnabled(int id) const {
       // different (like having "view-source:" on the front).
       NavigationEntry* active_entry =
           source_web_contents_->GetController().GetActiveEntry();
-      return download_util::IsSavableURL(
+      return content::IsSavableURL(
           (active_entry) ? active_entry->GetURL() : GURL());
     }