Move c/c/e/extension_set to top-level extensions/

chrome/browser/extensions/extension_warning_set.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_WARNING_SET_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_WARNING_SET_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "url/gurl.h"
 
 // TODO(battre) Remove the Extension prefix.
 
 namespace base {
 class FilePath;
 }
 
+namespace extensions {
+
 class ExtensionSet;
 
-namespace extensions {
-
 // This class is used by the ExtensionWarningService to represent warnings if
 // extensions misbehave. Note that the ExtensionWarningService deals only with
 // specific warnings that should trigger a badge on the Chrome menu button.
 class ExtensionWarning {
  public:
   enum WarningType {
     // Don't use this, it is only intended for the default constructor and
     // does not have localized warning messages for the UI.
     kInvalid = 0,
     // An extension caused excessive network delays.
@@ skipping 78 matching lines @@
 // Compare ExtensionWarnings based on the tuple of (extension_id, type).
 // The message associated with ExtensionWarnings is purely informational
 // and does not contribute to distinguishing extensions.
 bool operator<(const ExtensionWarning& a, const ExtensionWarning& b);
 
 typedef std::set<ExtensionWarning> ExtensionWarningSet;
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_WARNING_SET_H_