Consolidate scheme checks into an easy GURL method

net/http/http_util_icu.cc

Index: net/http/http_util_icu.cc
diff --git a/net/http/http_util_icu.cc b/net/http/http_util_icu.cc
index 64e7424df1442e015c8b5061d9e0a16a15fe7d78..4f38f84d75bac2bc52f005885f454a69ab5b1b2e 100644
--- a/net/http/http_util_icu.cc
+++ b/net/http/http_util_icu.cc
@@ -14,7 +14,7 @@ namespace net {
 
 // static
 std::string HttpUtil::PathForRequest(const GURL& url) {
-  DCHECK(url.is_valid() && (url.SchemeIs("http") || url.SchemeIs("https")));
+  DCHECK(url.is_valid() && url.SchemeIsHTTPOrHTTPS());
   if (url.has_query())
     return url.path() + "?" + url.query();
   return url.path();
@@ -23,8 +23,7 @@ std::string HttpUtil::PathForRequest(const GURL& url) {
 // static
 std::string HttpUtil::SpecForRequest(const GURL& url) {
   // We may get ftp scheme when fetching ftp resources through proxy.
-  DCHECK(url.is_valid() && (url.SchemeIs("http") ||
-                            url.SchemeIs("https") ||
+  DCHECK(url.is_valid() && (url.SchemeIsHTTPOrHTTPS() ||
                             url.SchemeIs("ftp")));
   return SimplifyUrlForRequest(url).spec();
 }