Fix modified headers from URLLoaderThrottles not being sent over the network.

r605518 fixed a modified URL from URLLoaderThrottles not being sent over the network. However it didn't fix the headers case, which is used by other policies. This fixes the ForceYouTubeRestrict and AllowedDomainsForApps policies.

Bug: 899268,900574
Change-Id: I5d9666a7497c2c7e5642e5c74d5bc65dc0407ea9
Reviewed-on: https://chromium-review.googlesource.com/c/1324932Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606247}

content/browser/loader/loader_browsertest.cc

@@ -1146,6 +1146,7 @@ class URLModifyingThrottle : public URLLoaderThrottle {
     GURL::Replacements replacements;
     replacements.SetQueryStr("foo=bar");
     request->url = request->url.ReplaceComponents(replacements);
+    request->headers.SetHeader("Foo", "Bar");
   }
 
  private:
@@ -1182,10 +1183,12 @@ IN_PROC_BROWSER_TEST_F(LoaderBrowserTest, URLLoaderThrottleModifyURL) {
       SetBrowserClientForTesting(&content_browser_client);
 
   std::set<GURL> urls_requested;
+  std::map<GURL, net::test_server::HttpRequest::HeaderMap> header_map;
   embedded_test_server()->RegisterRequestMonitor(base::BindLambdaForTesting(
       [&](const net::test_server::HttpRequest& request) {
         base::AutoLock auto_lock(lock);
         urls_requested.insert(request.GetURL());
+        header_map[request.GetURL()] = request.headers;
       }));
 
   ASSERT_TRUE(embedded_test_server()->Start());
@@ -1197,6 +1200,7 @@ IN_PROC_BROWSER_TEST_F(LoaderBrowserTest, URLLoaderThrottleModifyURL) {
     GURL expected_url(url.spec() + "?foo=bar");
     base::AutoLock auto_lock(lock);
     ASSERT_TRUE(urls_requested.find(expected_url) != urls_requested.end());
+    ASSERT_TRUE(header_map[expected_url]["Foo"] == "Bar");
   }
 
   SetBrowserClientForTesting(old_content_browser_client);

content/browser/loader/navigation_url_loader_impl.cc

@@ -504,6 +504,10 @@ class NavigationURLLoaderImpl::URLLoaderRequestController
               kNavigationUrlLoaderTrafficAnnotation));
     }
 
+    // A URLLoaderThrottle may have changed the headers.
+    request_info_->begin_params->headers =
+        resource_request_->headers.ToString();
+
     // The ResourceDispatcherHostImpl can be null in unit tests.
     if (!intercepted && ResourceDispatcherHostImpl::Get()) {
       ResourceDispatcherHostImpl::Get()->BeginNavigationRequest(

content/browser/service_worker/service_worker_browsertest.cc

@@ -3630,21 +3630,9 @@ IN_PROC_BROWSER_TEST_F(
   EXPECT_EQ(true, EvalJs(shell()->web_contents()->GetMainFrame(),
                          "!!navigator.serviceWorker.controller"));
 
-  if (base::FeatureList::IsEnabled(network::features::kNetworkService)) {
-    // The injected header should be present.
-    EXPECT_EQ("injected value", EvalJs(shell()->web_contents()->GetMainFrame(),
-                                       "document.body.textContent"));
-  } else {
-    // S13nServiceWorker: the injected header is not present. Throttle-modified
-    // headers are not propagated to network requests through
-    // ResourceDispatcherHost, because the legacy network code has its own code
-    // path that applies the same throttling independent from the navigation's
-    // URLLoaderThrottles.
-    DCHECK(base::FeatureList::IsEnabled(
-        blink::features::kServiceWorkerServicification));
-    EXPECT_EQ("None", EvalJs(shell()->web_contents()->GetMainFrame(),
-                             "document.body.textContent"));
-  }
+  // The injected header should be present.
+  EXPECT_EQ("injected value", EvalJs(shell()->web_contents()->GetMainFrame(),
+                                     "document.body.textContent"));
 
   SetBrowserClientForTesting(old_content_browser_client);
 }