DevTools: handle docked window close in DevToolsWindow, not DevToolsManager.

content/browser/debugger/devtools_window.cc

Index: content/browser/debugger/devtools_window.cc
diff --git a/content/browser/debugger/devtools_window.cc b/content/browser/debugger/devtools_window.cc
index 1b3ad5e19f1c38ddacad39a9b72df677a7c137d4..96af885f9f1587603778cc1df3a1c31e296c6411 100644
--- a/content/browser/debugger/devtools_window.cc
+++ b/content/browser/debugger/devtools_window.cc
@@ -221,6 +221,12 @@ void DevToolsWindow::SetDocked(bool docked) {
   Show(DEVTOOLS_TOGGLE_ACTION_NONE);
 }
 
+void DevToolsWindow::Close() {
+    DCHECK(docked_);
+    NotifyCloseListener();
+    InspectedTabClosing();
+}
+
 RenderViewHost* DevToolsWindow::GetRenderViewHost() {
   return tab_contents_->render_view_host();
 }