content: Move kHttpScheme constant into content namespace.

chrome/browser/autocomplete/search_provider.cc

Index: chrome/browser/autocomplete/search_provider.cc
diff --git a/chrome/browser/autocomplete/search_provider.cc b/chrome/browser/autocomplete/search_provider.cc
index 5b366b6d934596b9db26c3682c33a44ac1d83e1f..e222ad0706a56e15a42f24b7ac4ab4906ba3cdbe 100644
--- a/chrome/browser/autocomplete/search_provider.cc
+++ b/chrome/browser/autocomplete/search_provider.cc
@@ -745,7 +745,7 @@ bool SearchProvider::IsQuerySuitableForSuggest() const {
   // and happens to currently be invalid -- in which case we again want to run
   // our checks below.  Other QUERY cases are less likely to be URLs and thus we
   // assume we're OK.
-  if (!LowerCaseEqualsASCII(input_.scheme(), chrome::kHttpScheme) &&
+  if (!LowerCaseEqualsASCII(input_.scheme(), content::kHttpScheme) &&
       !LowerCaseEqualsASCII(input_.scheme(), content::kHttpsScheme) &&
       !LowerCaseEqualsASCII(input_.scheme(), chrome::kFtpScheme))
     return (input_.type() == AutocompleteInput::QUERY);