content: Move kHttpScheme constant into content namespace.

BUG=None
TEST=None, no functional change.
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Review URL: https://chromiumcodereview.appspot.com/23658056

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@223272 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/autocomplete/search_provider.cc b/chrome/browser/autocomplete/search_provider.cc
index 5b366b6..e222ad0 100644
--- a/chrome/browser/autocomplete/search_provider.cc
+++ b/chrome/browser/autocomplete/search_provider.cc
@@ -745,7 +745,7 @@
   // 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);