Restrict throbber messages to SingleSuggestionView objects.

chrome/browser/ui/cocoa/web_intent_sheet_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_sheet_controller.h"
 
 #include "base/memory/scoped_nsobject.h"
 #include "base/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/ui/browser_list.h"
@@ skipping 392 matching lines @@
     [suggestionLabel_ setStringValue:base::SysUTF16ToNSString(labelText)];
      textFrame.size.height +=
          [GTMUILocalizerAndLayoutTweaker sizeToFitFixedWidthTextField:
                suggestionLabel_];
      [suggestionLabel_ setFrame: textFrame];
   }
 }
 
 - (void)startThrobberForRow:(NSInteger)index {
   for (SingleSuggestionView* row in [self subviews]) {
-    [row setEnabled:NO];
-    if ([row tag] == index)
-      [row startThrobber];
+    if ([row isMemberOfClass:[SingleSuggestionView class]]) {
+      [row setEnabled:NO];
+      if ([row tag] == index) {
+        [row startThrobber];
+      }
+    }
   }
 }
 
 - (void)stopThrobber {
   for (SingleSuggestionView* row in [self subviews]) {
-    [row stopThrobber];
-    [row setEnabled:YES];
+    if ([row isMemberOfClass:[SingleSuggestionView class]]) {
+      [row stopThrobber];
+      [row setEnabled:YES];
+    }
   }
 }
 
 - (IBAction)installExtension:(id)sender {
   [controller_ installExtension:sender];
 }
 
 
 - (CGFloat)addStackedView:(NSView*)view
                toSubviews:(NSMutableArray*)subviews
@@ skipping 308 matching lines @@
 - (void)stopThrobber {
   [closeButton_ setEnabled:YES];
   [self setIntentButtonsEnabled:YES];
   [suggestionView_ stopThrobber];
 }
 
 - (void)closeSheet {
   [NSApp endSheet:[self window]];
 }
 @end  // WebIntentPickerSheetController