Revert of [Prerender] Restore request priorities when swapped in

chrome/browser/prerender/prerender_test_utils.cc

Index: chrome/browser/prerender/prerender_test_utils.cc
diff --git a/chrome/browser/prerender/prerender_test_utils.cc b/chrome/browser/prerender/prerender_test_utils.cc
index 5cd4402eab27784729705a2c2315b295998c2100..abded1130aa8f308e7d8cd03b5ef85343dab4949 100644
--- a/chrome/browser/prerender/prerender_test_utils.cc
+++ b/chrome/browser/prerender/prerender_test_utils.cc
@@ -177,10 +177,12 @@
 
 class HangingFirstRequestInterceptor : public net::URLRequestInterceptor {
  public:
-  HangingFirstRequestInterceptor(
-      const base::FilePath& file,
-      base::Callback<void(net::URLRequest*)> callback)
-      : file_(file), callback_(callback), first_run_(true) {}
+  HangingFirstRequestInterceptor(const base::FilePath& file,
+                                 base::Closure callback)
+      : file_(file),
+        callback_(callback),
+        first_run_(true) {
+  }
   ~HangingFirstRequestInterceptor() override {}
 
   net::URLRequestJob* MaybeInterceptRequest(
@@ -188,8 +190,10 @@
       net::NetworkDelegate* network_delegate) const override {
     if (first_run_) {
       first_run_ = false;
-      if (!callback_.is_null())
-        callback_.Run(request);
+      if (!callback_.is_null()) {
+        BrowserThread::PostTask(
+            BrowserThread::UI, FROM_HERE, callback_);
+      }
       return new HangingURLRequestJob(request, network_delegate);
     }
     return new net::URLRequestMockHTTPJob(
@@ -202,7 +206,7 @@
 
  private:
   base::FilePath file_;
-  base::Callback<void(net::URLRequest*)> callback_;
+  base::Closure callback_;
   mutable bool first_run_;
 };
 
@@ -246,17 +250,6 @@
 
   void FinishedProcessingCheck() override { NOTREACHED(); }
 };
-
-void CreateHangingFirstRequestInterceptorOnIO(
-    const GURL& url,
-    const base::FilePath& file,
-    base::Callback<void(net::URLRequest*)> callback_io) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-  std::unique_ptr<net::URLRequestInterceptor> interceptor(
-      new HangingFirstRequestInterceptor(file, callback_io));
-  net::URLRequestFilter::GetInstance()->AddUrlInterceptor(
-      url, std::move(interceptor));
-}
 
 }  // namespace
 
@@ -808,15 +801,13 @@
                file, content::BrowserThread::GetBlockingPool()));
 }
 
-void CreateHangingFirstRequestInterceptor(
-    const GURL& url,
-    const base::FilePath& file,
-    base::Callback<void(net::URLRequest*)> callback_io) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  content::BrowserThread::PostTask(
-      content::BrowserThread::IO, FROM_HERE,
-      base::Bind(&CreateHangingFirstRequestInterceptorOnIO, url, file,
-                 callback_io));
+void CreateHangingFirstRequestInterceptorOnIO(
+    const GURL& url, const base::FilePath& file, base::Closure callback) {
+  CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  std::unique_ptr<net::URLRequestInterceptor> interceptor(
+      new HangingFirstRequestInterceptor(file, callback));
+  net::URLRequestFilter::GetInstance()->AddUrlInterceptor(
+      url, std::move(interceptor));
 }
 
 }  // namespace test_utils