Move IsAboutBlank from url_utils to GURL

url/url_util.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef URL_URL_UTIL_H_
 #define URL_URL_UTIL_H_
 
 #include <string>
 #include <vector>
 
 #include "base/strings/string16.h"
 #include "base/strings/string_piece.h"
 #include "url/third_party/mozilla/url_parse.h"
 #include "url/url_canon.h"
 #include "url/url_constants.h"
 #include "url/url_export.h"
 
-class GURL;
-
 namespace url {
 
 // Init ------------------------------------------------------------------------
 
 // Initialization is NOT required, it will be implicitly initialized when first
 // used. However, this implicit initialization is NOT threadsafe. If you are
 // using this library in a threaded environment and don't have a consistent
 // "first call" (an example might be calling Add*Scheme with your special
 // application-specific schemes) then you will want to call initialize before
 // spawning any threads.
@@ skipping 131 matching lines @@
 // the list of allowed schemes for referrers (see AddReferrerScheme).
 URL_EXPORT bool IsReferrerScheme(const char* spec, const Component& scheme);
 
 // Returns true and sets |type| to the SchemeType of the given scheme
 // identified by |scheme| within |spec| if the scheme is in the list of known
 // standard-format schemes (see AddStandardScheme).
 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
 // the given |lower_ascii_domain| string. For example, if the canonicalized
 // hostname is "www.google.com", this will return true for "com", "google.com",
 // and "www.google.com" domains.
 //
 // If either of the input StringPieces is empty, the return value is false. The
 // input domain should be a lower-case ASCII string in order to match the
 // canonicalized host.
@@ skipping 85 matching lines @@
 
 // Escapes the given string as defined by the JS method encodeURIComponent. See
 // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/encodeURIComponent
 URL_EXPORT void EncodeURIComponent(const char* input,
                                    int length,
                                    CanonOutput* output);
 
 }  // namespace url
 
 #endif  // URL_URL_UTIL_H_