Add flag to specify if explicitly requested download is from web.

chrome/browser/plugin_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/plugin_installer.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_util.h"
 #include "base/process.h"
@@ skipping 26 matching lines @@
     content::ResourceContext* resource_context,
     int render_process_host_id,
     int render_view_host_routing_id,
     const ResourceDispatcherHost::DownloadStartedCallback& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   ResourceDispatcherHost* rdh = ResourceDispatcherHost::Get();
   scoped_ptr<net::URLRequest> request(new net::URLRequest(url, NULL));
   net::Error error = rdh->BeginDownload(
       request.Pass(),
+      false,  // is_content_initiated
       resource_context,
       render_process_host_id,
       render_view_host_routing_id,
       true,  // prefer_cache
       content::DownloadSaveInfo(),
       callback);
 
   if (error != net::OK) {
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
@@ skipping 133 matching lines @@
   DCHECK(state_ == kStateDownloading);
   state_ = kStateIdle;
   FOR_EACH_OBSERVER(PluginInstallerObserver, observers_, DownloadError(msg));
 }
 
 void PluginInstaller::DownloadCancelled() {
   DCHECK(state_ == kStateDownloading);
   state_ = kStateIdle;
   FOR_EACH_OBSERVER(PluginInstallerObserver, observers_, DownloadCancelled());
 }