Remove more unnecessary ChromeURLRequestContext members.

chrome/browser/ui/webui/chrome_url_data_manager.h

Index: chrome/browser/ui/webui/chrome_url_data_manager.h
diff --git a/chrome/browser/ui/webui/chrome_url_data_manager.h b/chrome/browser/ui/webui/chrome_url_data_manager.h
index 9bf894b4abb6a43becbc89d66495d37c2c23297a..7cff56a253c385043e2308fb907ad1f57efeeecf 100644
--- a/chrome/browser/ui/webui/chrome_url_data_manager.h
+++ b/chrome/browser/ui/webui/chrome_url_data_manager.h
@@ -8,6 +8,7 @@
 
 #include <string>
 
+#include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/task.h"
 #include "content/browser/browser_thread.h"
@@ -140,7 +141,8 @@ class ChromeURLDataManager {
     ChromeURLDataManagerBackend* backend_;
   };
 
-  explicit ChromeURLDataManager(Profile* profile);
+  explicit ChromeURLDataManager(
+      const base::Callback<ChromeURLDataManagerBackend*(void)>& backend);
   ~ChromeURLDataManager();
 
   // Adds a DataSource to the collection of data sources. This *must* be invoked
@@ -171,7 +173,10 @@ class ChromeURLDataManager {
   // was invoked).
   static bool IsScheduledForDeletion(const DataSource* data_source);
 
-  Profile* profile_;
+  // A callback that returns the ChromeURLDataManagerBackend. Only accessible on
+  // the IO thread. This is necessary because ChromeURLDataManager is created on
+  // the UI thread, but ChromeURLDataManagerBackend lives on the IO thread.
+  const base::Callback<ChromeURLDataManagerBackend*(void)> backend_;
 
   // Lock used when accessing |data_sources_|.
   static base::Lock delete_lock_;