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

chrome/browser/search/iframe_source.cc

Index: chrome/browser/search/iframe_source.cc
diff --git a/chrome/browser/search/iframe_source.cc b/chrome/browser/search/iframe_source.cc
index 925c97ed2c84107cfccc2c2ce7f9cf48c03f2730..b3682b8c1ff607b3b077ef0cfdf0f15b8d9950fe 100644
--- a/chrome/browser/search/iframe_source.cc
+++ b/chrome/browser/search/iframe_source.cc
@@ -24,7 +24,8 @@ IframeSource::~IframeSource() {
 
 std::string IframeSource::GetMimeType(
     const std::string& path_and_query) const {
-  std::string path(GURL("chrome-search://host/" + path_and_query).path());
+  GURL url(GURL("chrome-search://host/" + path_and_query));
+  base::StringPiece path = url.path();
   if (base::EndsWith(path, ".js", base::CompareCase::INSENSITIVE_ASCII))
     return "application/javascript";
   if (base::EndsWith(path, ".png", base::CompareCase::INSENSITIVE_ASCII))
@@ -38,7 +39,7 @@ std::string IframeSource::GetMimeType(
 
 bool IframeSource::ShouldServiceRequest(
     const net::URLRequest* request) const {
-  const std::string& path = request->url().path();
+  const std::string& path = request->url().path().as_string();
   return InstantIOContext::ShouldServiceRequest(request) &&
          request->url().SchemeIs(chrome::kChromeSearchScheme) &&
          request->url().host_piece() == GetSource() && ServesPath(path);