Fix a bug where redirect chain gets lost on process swap.

content/browser/renderer_host/global_request_id.h

Index: content/browser/renderer_host/global_request_id.h
diff --git a/content/browser/renderer_host/global_request_id.h b/content/browser/renderer_host/global_request_id.h
index 031026f0ea895c4a66215a84ef005fd67c71cbf7..0f6db6f1df00435d786675b3444f6c80b06b86fa 100644
--- a/content/browser/renderer_host/global_request_id.h
+++ b/content/browser/renderer_host/global_request_id.h
@@ -27,6 +27,14 @@ struct GlobalRequestID {
       return request_id < other.request_id;
     return child_id < other.child_id;
   }
+  bool operator==(const GlobalRequestID& other) const {
+    return child_id == other.child_id &&
+        request_id == other.request_id;
+  }
+  bool operator!=(const GlobalRequestID& other) const {
+    return child_id != other.child_id ||
+        request_id != other.request_id;
+  }
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_GLOBAL_REQUEST_ID_H_