DevTools: migrate DevTools APIs to use WebContents instead of RenderViewHost.

chrome/browser/extensions/devtools_util.cc

Index: chrome/browser/extensions/devtools_util.cc
diff --git a/chrome/browser/extensions/devtools_util.cc b/chrome/browser/extensions/devtools_util.cc
index 046d6cd5badc5c538334b2fe1c644f435a9c3c42..28e47906ca352367583a935b7c39a677026ae3e0 100644
--- a/chrome/browser/extensions/devtools_util.cc
+++ b/chrome/browser/extensions/devtools_util.cc
@@ -20,7 +20,7 @@ namespace {
 // Helper to inspect an ExtensionHost after it has been loaded.
 void InspectExtensionHost(ExtensionHost* host) {
   if (host)
-    DevToolsWindow::OpenDevToolsWindow(host->render_view_host());
+    DevToolsWindow::OpenDevToolsWindow(host->host_contents());
 }
 
 }  // namespace