Delete code for inspector preferences.

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index c63fd008fae289d388b80d1cce8773ca709736f7..5f9a789c6046002f8742938c9609f83b4721eddb 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -516,11 +516,6 @@ class CONTENT_EXPORT ContentBrowserClient {
                                    const GURL& url,
                                    WebPreferences* prefs) {}
 
-  // Inspector setting was changed and should be persisted.
-  virtual void UpdateInspectorSetting(RenderViewHost* rvh,
-                                      const std::string& key,
-                                      const std::string& value) {}
-
   // Notifies that BrowserURLHandler has been created, so that the embedder can
   // optionally add their own handlers.
   virtual void BrowserURLHandlerCreated(BrowserURLHandler* handler) {}