Content API changes to improve DOM stitching in ThreatDetails code.

content/renderer/web_frame_utils.h

Index: content/renderer/web_frame_utils.h
diff --git a/content/renderer/web_frame_utils.h b/content/renderer/web_frame_utils.h
index 798fb03a1a263c5852ef2113b983f599d0a3bf63..5b888d5cbb79a1144c84ae1e485ef6856b5b9757 100644
--- a/content/renderer/web_frame_utils.h
+++ b/content/renderer/web_frame_utils.h
@@ -11,10 +11,6 @@ class WebFrame;
 
 namespace content {
 
-// Returns the routing ID of the RenderFrameImpl or RenderFrameProxy
-// associated with |web_frame|.
-int GetRoutingIdForFrameOrProxy(blink::WebFrame* web_frame);
-
 // Returns either a WebLocalFrame or WebRemoteFrame based on |routing_id|.
 // Returns nullptr if |routing_id| doesn't properly map to a frame.
 blink::WebFrame* GetWebFrameFromRoutingIdForFrameOrProxy(int routing_id);