ProfileInfoCacheObserver: All methods now have a default empty implementation.

chrome/browser/profiles/profile_info_cache_observer.h

Index: chrome/browser/profiles/profile_info_cache_observer.h
diff --git a/chrome/browser/profiles/profile_info_cache_observer.h b/chrome/browser/profiles/profile_info_cache_observer.h
index 746c1ed833f89f487e15a1a62ca193afeb348351..c31341f92a7db3fa693d62be989778d8063bad64 100644
--- a/chrome/browser/profiles/profile_info_cache_observer.h
+++ b/chrome/browser/profiles/profile_info_cache_observer.h
@@ -18,13 +18,13 @@ class ProfileInfoCacheObserver {
  public:
   virtual ~ProfileInfoCacheObserver() {}
 
-  virtual void OnProfileAdded(const base::FilePath& profile_path) = 0;
-  virtual void OnProfileWillBeRemoved(const base::FilePath& profile_path) = 0;
+  virtual void OnProfileAdded(const base::FilePath& profile_path) {}
+  virtual void OnProfileWillBeRemoved(const base::FilePath& profile_path) {}
   virtual void OnProfileWasRemoved(const base::FilePath& profile_path,
-                                   const string16& profile_name) = 0;
+                                   const string16& profile_name) {}
   virtual void OnProfileNameChanged(const base::FilePath& profile_path,
-                                    const string16& old_profile_name) = 0;
-  virtual void OnProfileAvatarChanged(const base::FilePath& profile_path) = 0;
+                                    const string16& old_profile_name) {}
+  virtual void OnProfileAvatarChanged(const base::FilePath& profile_path) {}
 
  protected:
   ProfileInfoCacheObserver() {}