Make ResourceFetcher return Resources with LoadError instead of nullptrs.

third_party/WebKit/LayoutTests/http/tests/security/contentSecurityPolicy/script-src-strict-dynamic-whitelist.html

Index: third_party/WebKit/LayoutTests/http/tests/security/contentSecurityPolicy/script-src-strict-dynamic-whitelist.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/security/contentSecurityPolicy/script-src-strict-dynamic-whitelist.html b/third_party/WebKit/LayoutTests/http/tests/security/contentSecurityPolicy/script-src-strict-dynamic-whitelist.html
index 16eccc1833297e0dd18a8efdd5da3635a85a6b93..6b441c29313069069f3a646b4a1d4ff848206f77 100644
--- a/third_party/WebKit/LayoutTests/http/tests/security/contentSecurityPolicy/script-src-strict-dynamic-whitelist.html
+++ b/third_party/WebKit/LayoutTests/http/tests/security/contentSecurityPolicy/script-src-strict-dynamic-whitelist.html
@@ -19,28 +19,32 @@
         document.addEventListener("securitypolicyviolation", function (e) {
           blocked[e.lineNumber] = true;
         });
-
+    </script>
+    <!-- Need to individually wrap test cases in script blocks. Violation reports triggered by document.write() calls while the parser is waiting on blocking scipts are missing line numbers. See: https://crbug.com/649085. -->
+    <script nonce="abcdefg">
         async_test(function (t) {
           document.write("<scr" + "ipt src='" + generateURL("write") + "'></scr" + "ipt>");
           setTimeout(t.step_func_done(function () {
             assert_equals(loaded[generateURL("write")], undefined);
-            assert_true(blocked[24]);
+            assert_true(blocked[26]);
           }), 1);
         }, "Script injected via 'document.write' is not allowed with 'strict-dynamic', even if whitelisted.");
-
+    </script>
+    <script nonce="abcdefg">
         async_test(function (t) {
           document.write("<scr" + "ipt defer src='" + generateURL("write-defer") + "'></scr" + "ipt>");
           setTimeout(t.step_func_done(function () {
             assert_equals(loaded[generateURL("write-defer")], undefined);
-            assert_true(blocked[32]);
+            assert_true(blocked[35]);
           }), 1);
         }, "Deferred script injected via 'document.write' is not allowed with 'strict-dynamic', even if whitelisted.");
-
+    </script>
+    <script nonce="abcdefg">
         async_test(function (t) {
           document.write("<scr" + "ipt async src='" + generateURL("write-async") + "'></scr" + "ipt>");
           setTimeout(t.step_func_done(function () {
             assert_equals(loaded[generateURL("write-async")], undefined);
-            assert_true(blocked[40]);
+            assert_true(blocked[44]);
           }), 1);
         }, "Async script injected via 'document.write' is not allowed with 'strict-dynamic', even if whitelisted.");
     </script>