Cleanup: Move kChromeDevToolsScheme constant into content namespace.

chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc

Index: chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc
diff --git a/chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc b/chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc
index 55cf996f5778ef8d0f005007c2cfefd961815890..6d47d2b608808c7f73ffb7d3ef40b0532e2f5a38 100644
--- a/chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc
+++ b/chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc
@@ -51,7 +51,7 @@ RenderViewHost* FindFirstDevToolsHost() {
     RenderViewHost* host = RenderViewHost::From(widget);
     WebContents* contents = WebContents::FromRenderViewHost(host);
     GURL url = contents->GetURL();
-    if (url.SchemeIs(chrome::kChromeDevToolsScheme))
+    if (url.SchemeIs(content::kChromeDevToolsScheme))
       return host;
   }
   return NULL;