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

net/base/filename_util.cc

Index: net/base/filename_util.cc
diff --git a/net/base/filename_util.cc b/net/base/filename_util.cc
index 1e1d51c0e247709b479a2c44095c7ac117bd4176..519255f4e1196ef746d9de8abcd713e851e5a7f8 100644
--- a/net/base/filename_util.cc
+++ b/net/base/filename_util.cc
@@ -73,7 +73,7 @@ bool FileURLToFilePath(const GURL& url, base::FilePath* file_path) {
     // URL contains no host, the path is the filename. In this case, the path
     // will probably be preceeded with a slash, as in "/C:/foo.txt", so we
     // trim out that here.
-    path = url.path();
+    path = url.path().as_string();
     size_t first_non_slash = path.find_first_not_of("/\\");
     if (first_non_slash != std::string::npos && first_non_slash > 0)
       path.erase(0, first_non_slash);
@@ -82,7 +82,7 @@ bool FileURLToFilePath(const GURL& url, base::FilePath* file_path) {
     // on the path.
     path = "\\\\";
     path.append(host);
-    path.append(url.path());
+    path.append(url.path().as_string());
   }
   std::replace(path.begin(), path.end(), '/', '\\');
 #else  // defined(OS_WIN)
@@ -90,7 +90,7 @@ bool FileURLToFilePath(const GURL& url, base::FilePath* file_path) {
   // file://foo/bar.txt maps to /bar.txt.
   // TODO(dhg): This should probably take into account UNCs which could
   // include a hostname other than localhost or blank
-  std::string path = url.path();
+  std::string path = url.path().as_string();
 #endif  // !defined(OS_WIN)
 
   if (path.empty())