content: Move kHttpScheme constant 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 1c06fdda47f05238202dfe1981623309e1baf836..5ff1309f1a8dfef9dae037c229a81f676511ccf2 100644
--- a/content/browser/browser_url_handler_impl.cc
+++ b/content/browser/browser_url_handler_impl.cc
@@ -21,7 +21,7 @@ static bool HandleViewSource(GURL* url, BrowserContext* browser_context) {
     // Bug 26129: limit view-source to view the content and not any
     // other kind of 'active' url scheme like 'javascript' or 'data'.
     static const char* const allowed_sub_schemes[] = {
-      chrome::kHttpScheme, kHttpsScheme, chrome::kFtpScheme,
+      kHttpScheme, kHttpsScheme, chrome::kFtpScheme,
       chrome::kChromeDevToolsScheme, chrome::kChromeUIScheme,
       chrome::kFileScheme, chrome::kFileSystemScheme
     };