Move kFileScheme constant into content namespace.

chrome/renderer/content_settings_observer.cc

Index: chrome/renderer/content_settings_observer.cc
diff --git a/chrome/renderer/content_settings_observer.cc b/chrome/renderer/content_settings_observer.cc
index 0507e537df7f8cc6092777de5a06ca92047a96f4..62b62381acada6fad49132b3fde003c1355f604f 100644
--- a/chrome/renderer/content_settings_observer.cc
+++ b/chrome/renderer/content_settings_observer.cc
@@ -663,8 +663,8 @@ bool ContentSettingsObserver::IsWhitelistedForContentSettings(
 
   // If the scheme is file:, an empty file name indicates a directory listing,
   // which requires JavaScript to function properly.
-  if (EqualsASCII(origin.protocol(), chrome::kFileScheme)) {
-    return document_url.SchemeIs(chrome::kFileScheme) &&
+  if (EqualsASCII(origin.protocol(), content::kFileScheme)) {
+    return document_url.SchemeIs(content::kFileScheme) &&
            document_url.ExtractFileName().empty();
   }