Move IsAboutBlank from url_utils to GURL

url/url_util.h

Index: url/url_util.h
diff --git a/url/url_util.h b/url/url_util.h
index 08d660890dddff5ae7e57c37d212c19657d5f489..d0a8f22b6ff9621479d6208d0c92abf6689695f0 100644
--- a/url/url_util.h
+++ b/url/url_util.h
@@ -15,8 +15,6 @@
 #include "url/url_constants.h"
 #include "url/url_export.h"
 
-class GURL;
-
 namespace url {
 
 // Init ------------------------------------------------------------------------
@@ -168,10 +166,6 @@ URL_EXPORT bool GetStandardSchemeType(const char* spec,
                                       const Component& scheme,
                                       SchemeType* type);
 
-// Check whether the url is of the form about:blank, about:blank?foo or
-// about:blank/#foo.
-URL_EXPORT bool IsAboutBlank(const GURL& url);
-
 // Hosts  ----------------------------------------------------------------------
 
 // Returns true if the |canonicalized_host| matches or is in the same domain as