Prune shared extendion module after extension updating.

chrome/browser/extensions/webstore_installer.cc

 // 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.
 
 #include "chrome/browser/extensions/webstore_installer.h"
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 367 matching lines @@
       break;
     }
 
     default:
       NOTREACHED();
   }
 }
 
 void WebstoreInstaller::OnExtensionInstalled(
     content::BrowserContext* browser_context,
-    const Extension* extension) {
+    const Extension* extension,
+    bool is_update) {
   CHECK(profile_->IsSameProfile(Profile::FromBrowserContext(browser_context)));
   if (pending_modules_.empty())
     return;
   SharedModuleInfo::ImportInfo info = pending_modules_.front();
   if (extension->id() != info.extension_id)
     return;
   pending_modules_.pop_front();
 
   // Clean up local state from the current download.
   if (download_item_) {
@@ skipping 343 matching lines @@
         1,
         kMaxSizeKb,
         kNumBuckets);
   }
   UMA_HISTOGRAM_BOOLEAN(
       "Extensions.WebstoreDownload.InterruptTotalSizeUnknown",
       total_bytes <= 0);
 }
 
 }  // namespace extensions