[Mac] AppController needs to update its "last profile" pointer when the active profile is deleted

chrome/browser/app_controller_mac.mm

Index: chrome/browser/app_controller_mac.mm
diff --git a/chrome/browser/app_controller_mac.mm b/chrome/browser/app_controller_mac.mm
index b826354036cccdb759e162d615228b1b7d1949fd..63c42b6604dd21acc3c3785ee9ec8dcc72f209e9 100644
--- a/chrome/browser/app_controller_mac.mm
+++ b/chrome/browser/app_controller_mac.mm
@@ -28,6 +28,7 @@
 #include "chrome/browser/first_run/first_run.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/printing/print_dialog_cloud.h"
+#include "chrome/browser/profiles/profile_info_cache_observer.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/service/service_process_control.h"
 #include "chrome/browser/sessions/session_restore.h"
@@ -190,8 +191,57 @@ void RecordLastRunAppBundlePath() {
 - (BOOL)userWillWaitForInProgressDownloads:(int)downloadCount;
 - (BOOL)shouldQuitWithInProgressDownloads;
 - (void)executeApplication:(id)sender;
+- (void)profileWasRemoved:(const base::FilePath&)profilePath;
 @end
 
+class AppControllerProfileObserver : public ProfileInfoCacheObserver {
+ public:
+  AppControllerProfileObserver(
+      ProfileManager* profile_manager, AppController* app_controller)
+      : profile_manager_(profile_manager),
+        app_controller_(app_controller) {
+    DCHECK(profile_manager_);
+    DCHECK(app_controller_);
+    profile_manager_->GetProfileInfoCache().AddObserver(this);
+  }
+
+  virtual ~AppControllerProfileObserver() {
+    DCHECK(profile_manager_);
+    profile_manager_->GetProfileInfoCache().RemoveObserver(this);
+  }
+
+ private:
+  // ProfileInfoCacheObserver implementation:
+
+  virtual void OnProfileAdded(const base::FilePath& profile_path) OVERRIDE {
+  }
+
+  virtual void OnProfileWasRemoved(const base::FilePath& profile_path,
+                                   const string16& profile_name) OVERRIDE {
+    // When a profile is deleted we need to notify the AppController,
+    // so it can correctly update its pointer to the last used profile.
+    [app_controller_ profileWasRemoved:profile_path];
+  }
+
+  virtual void OnProfileWillBeRemoved(
+      const base::FilePath& profile_path) OVERRIDE {
+  }
+
+  virtual void OnProfileNameChanged(const base::FilePath& profile_path,
+                                    const string16& old_profile_name) OVERRIDE {
+  }
+
+  virtual void OnProfileAvatarChanged(
+      const base::FilePath& profile_path) OVERRIDE {
+  }
+
+  ProfileManager* profile_manager_;
+
+  AppController* app_controller_;  // Weak; owns us.
+
+  DISALLOW_COPY_AND_ASSIGN(AppControllerProfileObserver);
+};
+
 @implementation AppController
 
 @synthesize startupComplete = startupComplete_;
@@ -585,6 +635,11 @@ void RecordLastRunAppBundlePath() {
   EncodingMenuControllerDelegate::BuildEncodingMenu([self lastProfile],
                                                     encodingMenu);
 
+  // Instantiate the ProfileInfoCache observer so that we can get
+  // notified when a profile is deleted.
+  profileInfoCacheObserver_.reset(new AppControllerProfileObserver(
+      g_browser_process->profile_manager(), self));
+
   // Since Chrome is localized to more languages than the OS, tell Cocoa which
   // menu is the Help so it can add the search item to it.
   [NSApp setHelpMenu:helpMenu_];
@@ -714,6 +769,18 @@ void RecordLastRunAppBundlePath() {
   return service && !service->entries().empty();
 }
 
+// Called from the AppControllerProfileObserver every time a profile is deleted.
+- (void)profileWasRemoved:(const base::FilePath&)profilePath {
+  Profile* lastProfile = [self lastProfile];
+
+  // If the lastProfile has been deleted, the profile manager has
+  // already loaded a new one, so the pointer needs to be updated;
+  // otherwise we will try to start up a browser window with a pointer
+  // to the old profile.
+  if (profilePath == lastProfile->GetPath())
+    lastProfile_ = g_browser_process->profile_manager()->GetLastUsedProfile();
+}
+
 // Returns true if there is a modal window (either window- or application-
 // modal) blocking the active browser. Note that tab modal dialogs (HTTP auth
 // sheets) will not count as blocking the browser. But things like open/save