PlzNavigate: don't stop all loaders when renderer-initiated nav fails

content/common/frame_messages.h

Index: content/common/frame_messages.h
diff --git a/content/common/frame_messages.h b/content/common/frame_messages.h
index 5941797043afea971c26758bb1a788fac62697ac..5e922f3893d0b65500406c06bb0dab57e794b459 100644
--- a/content/common/frame_messages.h
+++ b/content/common/frame_messages.h
@@ -915,6 +915,11 @@ IPC_MESSAGE_ROUTED4(FrameMsg_CommitNavigation,
                     content::RequestNavigationParams  /* request_params */)
 
 // PlzNavigate
+// Informs the renderer that the browser stopped processing a renderer-initiated
+// navigation.

[Charlie Reis, 2017/03/23 16:52:53]

Please clarify how this differs from FrameMsg_Stop (e.g., doesn't stop ongoing
loads in the current page).

+IPC_MESSAGE_ROUTED0(FrameMsg_DroppedNavigation)
+
+// PlzNavigate
 // Tells the renderer that a navigation failed with the error code |error_code|
 // and that the renderer should display an appropriate error page.
 IPC_MESSAGE_ROUTED4(FrameMsg_FailedNavigation,