content: Move kHttpScheme constant into content namespace.

chrome/browser/search_engines/template_url_service.cc

Index: chrome/browser/search_engines/template_url_service.cc
diff --git a/chrome/browser/search_engines/template_url_service.cc b/chrome/browser/search_engines/template_url_service.cc
index a8e7dcf8fec6947eee32cfe95d9c01299a088a1c..63a4808f8e28d09ac42a0e6045f47fa1a8e634e6 100644
--- a/chrome/browser/search_engines/template_url_service.cc
+++ b/chrome/browser/search_engines/template_url_service.cc
@@ -372,7 +372,7 @@ string16 TemplateURLService::CleanUserInputKeyword(const string16& keyword) {
     // type a web address, but rather an FTP, file:, or other scheme URL, or a
     // search query with some sort of initial operator (e.g. "site:").
     if (result.compare(0, scheme_component.end(),
-                       ASCIIToUTF16(chrome::kHttpScheme)) &&
+                       ASCIIToUTF16(content::kHttpScheme)) &&
         result.compare(0, scheme_component.end(),
                        ASCIIToUTF16(content::kHttpsScheme)))
       return string16();