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

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 61554f7f7208b7e9ecac82b1c2962ae21640ff39..abe87af86e27d03112cabbb0aa023fdc07e746f1 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -444,11 +444,11 @@ NOINLINE static void CrashIntentionally() {
 static void MaybeHandleDebugURL(const GURL& url) {
   if (!url.SchemeIs(chrome::kChromeUIScheme))
     return;
-  if (url == GURL(chrome::kChromeUICrashURL)) {
+  if (url == GURL(kChromeUICrashURL)) {
     CrashIntentionally();
-  } else if (url == GURL(chrome::kChromeUIKillURL)) {
+  } else if (url == GURL(kChromeUIKillURL)) {
     base::KillProcess(base::GetCurrentProcessHandle(), 1, false);
-  } else if (url == GURL(chrome::kChromeUIHangURL)) {
+  } else if (url == GURL(kChromeUIHangURL)) {
     for (;;) {
       base::PlatformThread::Sleep(base::TimeDelta::FromSeconds(1));
     }