content: Move kViewSourceScheme constant into content namespace.

chrome/browser/ui/browser_navigator.cc

Index: chrome/browser/ui/browser_navigator.cc
diff --git a/chrome/browser/ui/browser_navigator.cc b/chrome/browser/ui/browser_navigator.cc
index d9ed0d33189b11c7e23e88428e494c973721b7c3..4c6b399ec4594bccf42a81620cd471269cf5679c 100644
--- a/chrome/browser/ui/browser_navigator.cc
+++ b/chrome/browser/ui/browser_navigator.cc
@@ -640,13 +640,13 @@ void Navigate(NavigateParams* params) {
 
 bool IsURLAllowedInIncognito(const GURL& url,
                              content::BrowserContext* browser_context) {
-  if (url.scheme() == chrome::kViewSourceScheme) {
+  if (url.scheme() == content::kViewSourceScheme) {
     // A view-source URL is allowed in incognito mode only if the URL itself
     // is allowed in incognito mode. Remove the "view-source:" from the start
     // of the URL and validate the rest.
     std::string stripped_spec = url.spec();
-    DCHECK_GT(stripped_spec.size(), strlen(kViewSourceScheme));
-    stripped_spec.erase(0, strlen(kViewSourceScheme)+1);
+    DCHECK_GT(stripped_spec.size(), strlen(content::kViewSourceScheme));
+    stripped_spec.erase(0, strlen(content::kViewSourceScheme) + 1);
     GURL stripped_url(stripped_spec);
     return stripped_url.is_valid() &&
         IsURLAllowedInIncognito(stripped_url, browser_context);