content: Move more constants from url_constants.h into content namespace.

content/browser/browser_url_handler_impl.cc

Index: content/browser/browser_url_handler_impl.cc
diff --git a/content/browser/browser_url_handler_impl.cc b/content/browser/browser_url_handler_impl.cc
index 9edfd24e21aa14b9bd5d9441a51bf3abc1a7b72f..e10e997132b9bd63708f0f1c1f427fb73445fc28 100644
--- a/content/browser/browser_url_handler_impl.cc
+++ b/content/browser/browser_url_handler_impl.cc
@@ -62,9 +62,9 @@ static bool ReverseViewSource(GURL* url, BrowserContext* browser_context) {
 
 static bool HandleDebugUrl(GURL* url, BrowserContext* browser_context) {
   // Circumvent processing URLs that the renderer process will handle.
-  return *url == GURL(chrome::kChromeUICrashURL) ||
-         *url == GURL(chrome::kChromeUIHangURL) ||
-         *url == GURL(chrome::kChromeUIKillURL) ||
+  return *url == GURL(kChromeUICrashURL) ||
+         *url == GURL(kChromeUIHangURL) ||
+         *url == GURL(kChromeUIKillURL) ||
          *url == GURL(kChromeUIShorthangURL);
 }