Move ClosePage() from RenderViewHost to WebContents.

content/browser/devtools/render_frame_devtools_agent_host.cc

Index: content/browser/devtools/render_frame_devtools_agent_host.cc
diff --git a/content/browser/devtools/render_frame_devtools_agent_host.cc b/content/browser/devtools/render_frame_devtools_agent_host.cc
index 9d09b9829ecee8965f0f648057d5e2cb0c269bc1..409ee0d352a0e5f53a2aec359df68d65f946e602 100644
--- a/content/browser/devtools/render_frame_devtools_agent_host.cc
+++ b/content/browser/devtools/render_frame_devtools_agent_host.cc
@@ -464,8 +464,8 @@ bool RenderFrameDevToolsAgentHost::Activate() {
 }
 
 bool RenderFrameDevToolsAgentHost::Close() {
-  if (render_frame_host_) {
-    render_frame_host_->GetRenderViewHost()->ClosePage();
+  if (web_contents()) {
+    web_contents()->ClosePage();
     return true;
   }
   return false;