[DevTools] Support multiple sessions in content/ domain handlers

content/browser/devtools/protocol/target_handler.h

Index: content/browser/devtools/protocol/target_handler.h
diff --git a/content/browser/devtools/protocol/target_handler.h b/content/browser/devtools/protocol/target_handler.h
index cb11a0896520b058121b39b72b7a61a00297866b..f239667f5036b2d5906dc4db089c0ea982b4f651 100644
--- a/content/browser/devtools/protocol/target_handler.h
+++ b/content/browser/devtools/protocol/target_handler.h
@@ -16,7 +16,7 @@
 
 namespace content {
 
-class DevToolsSession;
+class DevToolsAgentHostImpl;
 class RenderFrameHostImpl;
 
 namespace protocol {
@@ -30,7 +30,7 @@ class TargetHandler : public DevToolsDomainHandler,
   TargetHandler();
   ~TargetHandler() override;
 
-  static TargetHandler* FromSession(DevToolsSession* session);
+  static std::vector<TargetHandler*> ForAgentHost(DevToolsAgentHostImpl* host);
 
   void Wire(UberDispatcher* dispatcher) override;
   void SetRenderFrameHost(RenderFrameHostImpl* host) override;