Remove security_origin member from content::Stream.

content/browser/streams/stream.h

Index: content/browser/streams/stream.h
diff --git a/content/browser/streams/stream.h b/content/browser/streams/stream.h
index 912e4374e6a9e6b49f90d6d14c3384ce71e74401..4dd852f1a43ad8d7912b338e98ca3725c58935df 100644
--- a/content/browser/streams/stream.h
+++ b/content/browser/streams/stream.h
@@ -38,10 +38,13 @@ class CONTENT_EXPORT Stream : public base::RefCountedThreadSafe<Stream> {
     STREAM_EMPTY,
   };
 
-  // Creates a stream useable from the |security_origin|.
+  // Creates a stream.
+  //
+  // Security origin of Streams is checked in Blink (See BlobRegistry,
+  // BlobURL and SecurityOrigin to understand how it works). There's no security
+  // origin check in Chromium side for now.
   Stream(StreamRegistry* registry,
          StreamWriteObserver* write_observer,
-         const GURL& security_origin,
          const GURL& url);
 
   // Sets the reader of this stream. Returns true on success, or false if there
@@ -75,8 +78,6 @@ class CONTENT_EXPORT Stream : public base::RefCountedThreadSafe<Stream> {
 
   const GURL& url() const { return url_; }
 
-  const GURL& security_origin() const { return security_origin_; }
-
  private:
   friend class base::RefCountedThreadSafe<Stream>;
 
@@ -88,7 +89,6 @@ class CONTENT_EXPORT Stream : public base::RefCountedThreadSafe<Stream> {
   size_t data_bytes_read_;
   bool can_add_data_;
 
-  GURL security_origin_;
   GURL url_;
 
   scoped_refptr<net::IOBuffer> data_;