[WIP] make GURL::path() return a StringPiece

components/url_matcher/url_matcher.cc

Index: components/url_matcher/url_matcher.cc
diff --git a/components/url_matcher/url_matcher.cc b/components/url_matcher/url_matcher.cc
index 41d8c7b13c328ea47a63010063ee818218b36346..103a129880211e97ef11fcbf975b23e278b1c740 100644
--- a/components/url_matcher/url_matcher.cc
+++ b/components/url_matcher/url_matcher.cc
@@ -233,8 +233,8 @@ bool URLMatcherCondition::IsMatch(
       return url.host().find(string_pattern_->pattern()) !=
           std::string::npos;
     case PATH_CONTAINS:
-      return url.path().find(string_pattern_->pattern()) !=
-          std::string::npos;
+      return url.path().as_string().find(string_pattern_->pattern()) !=
+             std::string::npos;
     case QUERY_CONTAINS:
       return url.query().find(string_pattern_->pattern()) !=
           std::string::npos;
@@ -268,7 +268,7 @@ URLMatcherConditionFactory::~URLMatcherConditionFactory() {
 std::string URLMatcherConditionFactory::CanonicalizeURLForComponentSearches(
     const GURL& url) const {
   return kBeginningOfURL + CanonicalizeHostname(url.host()) + kEndOfDomain +
-         url.path() + kEndOfPath +
+         url.path().as_string() + kEndOfPath +
          (url.has_query() ? CanonicalizeQuery(url.query(), true, true)
                           : std::string()) +
          kEndOfURL;