Move IsAboutBlank from url_utils to GURL

url/url_util.cc

Index: url/url_util.cc
diff --git a/url/url_util.cc b/url/url_util.cc
index 83cf71f3de14d48581f5972a70cfb1d87ebdc936..a79e114fed36ae6fdd9822ebdb9a0c49a948ee26 100644
--- a/url/url_util.cc
+++ b/url/url_util.cc
@@ -10,7 +10,6 @@
 #include "base/debug/leak_annotations.h"
 #include "base/logging.h"
 #include "base/strings/string_util.h"
-#include "url/gurl.h"
 #include "url/url_canon_internal.h"
 #include "url/url_constants.h"
 #include "url/url_file.h"
@@ -645,21 +644,6 @@ bool IsReferrerScheme(const char* spec, const Component& scheme) {
   return DoIsInSchemes(spec, scheme, &unused_scheme_type, *referrer_schemes);
 }
 
-bool IsAboutBlank(const GURL& url) {
-  if (!url.SchemeIs(url::kAboutScheme))
-    return false;
-
-  if (url.has_host() || url.has_username() || url.has_password() ||
-      url.has_port()) {
-    return false;
-  }
-
-  if (url.path() != kAboutBlankPath && url.path() != kAboutBlankWithHashPath)
-    return false;
-
-  return true;
-}
-
 bool FindAndCompareScheme(const char* str,
                           int str_len,
                           const char* compare,