Fix generation of inner_url in GURL::Replacements.

url/gurl.h

Index: url/gurl.h
diff --git a/url/gurl.h b/url/gurl.h
index 103f1d8519ca1a323b3dd576235bca4490382a4f..8a1750fa5bb42b438ab395abd32ca45bde04027d 100644
--- a/url/gurl.h
+++ b/url/gurl.h
@@ -394,6 +394,10 @@ class URL_EXPORT GURL {
 
   // Returns the inner URL of a nested URL (currently only non-null for
   // filesystem URLs).
+  //
+  // TODO(mmenke): inner_url().spec() currently returns the same value as
+  // caling spec() on the GURL itself. This should be fixed.
+  // See https://crbug.com/619596
   const GURL* inner_url() const {
     return inner_url_.get();
   }