Clean up a few more unused globals.

content/common/browser_plugin/browser_plugin_constants.cc

 // Copyright 2013 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.
 
 #include "content/common/browser_plugin/browser_plugin_constants.h"
 
 namespace content {
 
 namespace browser_plugin {
 
@@ skipping 24 matching lines @@
 const char kAttributeAutoSize[] = "autosize";
 const char kAttributeContentWindow[] = "contentWindow";
 const char kAttributeMaxHeight[] = "maxheight";
 const char kAttributeMaxWidth[] = "maxwidth";
 const char kAttributeMinHeight[] = "minheight";
 const char kAttributeMinWidth[] = "minwidth";
 const char kAttributeName[] = "name";
 const char kAttributePartition[] = "partition";
 const char kAttributeSrc[] = "src";
 
-// Events.
-const char kEventSizeChanged[] = "sizechanged";
-
 // Parameters/properties on events.
 const char kDefaultPromptText[] = "defaultPromptText";
 const char kId[] = "id";
 const char kInitialHeight[] = "initialHeight";
 const char kInitialWidth[] = "initialWidth";
 const char kLastUnlockedBySelf[] = "lastUnlockedBySelf";
 const char kMessageText[] = "messageText";
 const char kMessageType[] = "messageType";
 const char kName[] = "name";
 const char kPermission[] = "permission";
@@ skipping 22 matching lines @@
     "Cannot remove partition attribute after navigating.";
 
 // Other.
 const char kBrowserPluginGuestManagerKeyName[] = "browser_plugin_guest_manager";
 const int kInstanceIDNone = 0;
 const int kInvalidPermissionRequestID = 0;
 
 }  // namespace browser_plugin
 
 }  // namespace content