[Web Intents, Mac] Allow re-open after cancellation/close of picker bubble

chrome/browser/ui/cocoa/web_intent_bubble_controller.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/web_intent_bubble_controller.h"
 
 #include "base/memory/scoped_nsobject.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/ui/browser_list.h"
 #import "chrome/browser/ui/cocoa/hyperlink_button_cell.h"
@@ skipping 106 matching lines @@
   GURL url(l10n_util::GetStringUTF8(IDS_WEBSTORE_URL));
   Browser* browser = BrowserList::GetLastActive();
   OpenURLParams params(
       url, Referrer(), NEW_FOREGROUND_TAB, content::PAGE_TRANSITION_LINK,
       false);
   browser->OpenURL(params);
 }
 
 // A picker button has been pressed - invoke corresponding service.
 - (IBAction)invokeService:(id)sender {
-  if (picker_) {
-    WebIntentPickerCocoa* temp = picker_;
-    picker_ = NULL;  // Abandon picker, we are done with it.
-    temp->OnServiceChosen([sender tag]);
-  }
+  if (picker_)
+    picker_->OnServiceChosen([sender tag]);
 }
 
 // Sets proprties on the given |field| to act as the title or description labels
 // in the bubble.
 - (void)configureTextFieldAsLabel:(NSTextField*)field {
   [field setEditable:NO];
   [field setSelectable:YES];
   [field setDrawsBackground:NO];
   [field setBezeled:NO];
 }
@@ skipping 156 matching lines @@
       NSHeight([[self window] frame]);
 
   [[self window] setFrame:windowFrame display:YES animate:YES];
 
   // Replace the window's content.
   [[[self window] contentView] setSubviews:
       [NSArray arrayWithObject:contentView]];
 }
 
 @end  // WebIntentBubbleController