Fix race condition in utility process clients

content/browser/indexed_db/idbbindingutilities_browsertest.cc

Index: content/browser/indexed_db/idbbindingutilities_browsertest.cc
diff --git a/content/browser/indexed_db/idbbindingutilities_browsertest.cc b/content/browser/indexed_db/idbbindingutilities_browsertest.cc
index 0793e0bd94a184864441d9534a09b8f235674d7b..3bcc69d64f7448659fd1ac09deda10f182467781 100644
--- a/content/browser/indexed_db/idbbindingutilities_browsertest.cc
+++ b/content/browser/indexed_db/idbbindingutilities_browsertest.cc
@@ -86,7 +86,6 @@ class IDBKeyPathHelper : public UtilityProcessHost::Client {
  public:
   IDBKeyPathHelper()
       : expected_id_(0),
-        utility_process_host_(NULL),
         value_for_key_path_failed_(false) {
   }
 
@@ -99,7 +98,7 @@ class IDBKeyPathHelper : public UtilityProcessHost::Client {
     }
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
     utility_process_host_ =
-        new UtilityProcessHost(this, BrowserThread::IO);
+        (new UtilityProcessHost(this, BrowserThread::IO))->AsWeakPtr();
     utility_process_host_->set_use_linux_zygote(true);
     utility_process_host_->StartBatchMode();
     BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
@@ -115,7 +114,7 @@ class IDBKeyPathHelper : public UtilityProcessHost::Client {
     }
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
     utility_process_host_->EndBatchMode();
-    utility_process_host_ = NULL;
+    utility_process_host_.reset();
     BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
                             MessageLoop::QuitClosure());
   }
@@ -217,7 +216,7 @@ class IDBKeyPathHelper : public UtilityProcessHost::Client {
  private:
   int expected_id_;
   std::vector<IndexedDBKey> expected_keys_;
-  UtilityProcessHost* utility_process_host_;
+  base::WeakPtr<UtilityProcessHost> utility_process_host_;
   bool value_for_key_path_failed_;
   content::SerializedScriptValue expected_value_;
 };