Prevent imbalanced keepalive counts in ProcessManager

extensions/browser/process_manager.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 "extensions/browser/process_manager.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 535 matching lines @@
                  extension_id,
                  sequence_id),
       base::TimeDelta::FromMilliseconds(g_event_page_suspending_time_msec));
 }
 
 void ProcessManager::OnNetworkRequestStarted(
     content::RenderFrameHost* render_frame_host,
     uint64 request_id) {
   ExtensionHost* host = GetBackgroundHostForExtension(
       GetExtensionID(render_frame_host));
+  auto result = pending_network_requests_.insert(request_id);
+  DCHECK(result.second) << "Duplicate network request IDs.";
   if (host && IsFrameInExtensionHost(host, render_frame_host)) {
     IncrementLazyKeepaliveCount(host->extension());
     host->OnNetworkRequestStarted(request_id);
   }
 }
 
 void ProcessManager::OnNetworkRequestDone(
     content::RenderFrameHost* render_frame_host,
     uint64 request_id) {
   ExtensionHost* host = GetBackgroundHostForExtension(
       GetExtensionID(render_frame_host));
   if (host && IsFrameInExtensionHost(host, render_frame_host)) {
     host->OnNetworkRequestDone(request_id);
-    DecrementLazyKeepaliveCount(host->extension());
+    if (pending_network_requests_.erase(request_id))
+      DecrementLazyKeepaliveCount(host->extension());
   }
 }
 
 void ProcessManager::CancelSuspend(const Extension* extension) {
   bool& is_closing = background_page_data_[extension->id()].is_closing;
   ExtensionHost* host = GetBackgroundHostForExtension(extension->id());
   if (host && is_closing) {
     is_closing = false;
     host->render_process_host()->Send(
         new ExtensionMsg_CancelSuspend(extension->id()));
@@ skipping 378 matching lines @@
   if (extension && !IncognitoInfo::IsSplitMode(extension)) {
     BrowserContext* original_context =
         ExtensionsBrowserClient::Get()->GetOriginalContext(browser_context());
     return ProcessManager::Get(original_context)->GetSiteInstanceForURL(url);
   }
 
   return ProcessManager::GetSiteInstanceForURL(url);
 }
 
 }  // namespace extensions