Adjust tests so that response returns text/css

Adjust tests so that response returns text/css in order
to not fail these tests once stylesheet loading gets more strict.

Bug: 752830

Change-Id: I51ada4de148c384842911f001761b97f71a9082a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2007112Reviewed-by: Hiroshige Hayashizaki <hiroshige@chromium.org>
Commit-Queue: Rob Buis <rbuis@igalia.com>
Cr-Commit-Position: refs/heads/master@{#734202}

third_party/blink/web_tests/http/tests/cache/resources/etag-200-different.php

@@ -4,6 +4,10 @@
 header('ETag: foo');
 header('Cache-control: max-age=0');
 
+if ($_GET['type'] == 'css') {
+    header('Content-Type: text/css');
+}
+
 if ($_SERVER['HTTP_IF_NONE_MATCH'] == 'foo') {
     // The body after revalidation.
     echo "/* after revalidation */";

third_party/blink/web_tests/http/tests/cache/resources/etag-200-empty.php

@@ -4,6 +4,10 @@
 header('ETag: foo');
 header('Cache-control: max-age=0');
 
+if ($_GET['type'] == 'css') {
+    header('Content-Type: text/css');
+}
+
 if ($_SERVER['HTTP_IF_NONE_MATCH'] == 'foo') {
     // The body is intentionally empty.
     exit;

third_party/blink/web_tests/http/tests/cache/resources/etag.php

@@ -2,6 +2,10 @@
 header('ETag: foo');
 header('Cache-control: max-age=0');
 
+if ($_GET['type'] == 'css') {
+    header('Content-Type: text/css');
+}
+
 if ($_SERVER['HTTP_IF_NONE_MATCH'] == 'foo') {
     header('HTTP/1.1 304 Not Modified');
     exit;

third_party/blink/web_tests/http/tests/security/subresourceIntegrity/empty-after-revalidate-css.html

@@ -14,12 +14,12 @@
     link.onload = t_css.unreached_func('Second request should fail');
     link.onerror = t_css.step_func_done();
     link.href =
-      "../../cache/resources/etag-200-empty.php?empty-after-revalidate-css";
+      "../../cache/resources/etag-200-empty.php?type=css&empty-after-revalidate-css";
     document.head.appendChild(link);
   }
 </script>
 <link
-  href="../../cache/resources/etag-200-empty.php?empty-after-revalidate-css"
+  href="../../cache/resources/etag-200-empty.php?type=css&empty-after-revalidate-css"
   rel="stylesheet"
   integrity="sha256-YsI40D9FX0QghiYVdxQyySP2TOmARkLC5uPRO8RL2dE="
   onload="t_css.step_timeout(revalidate_css, 0)"

third_party/blink/web_tests/http/tests/security/subresourceIntegrity/revalidation-failed-css.html

@@ -14,12 +14,12 @@
     link.onload = t_css.unreached_func('Second request should fail');
     link.onerror = t_css.step_func_done();
     link.href =
-      "../../cache/resources/etag-200-different.php?empty-after-revalidate-css";
+      "../../cache/resources/etag-200-different.php?type=css&empty-after-revalidate-css";
     document.head.appendChild(link);
   }
 </script>
 <link
-  href="../../cache/resources/etag-200-different.php?empty-after-revalidate-css"
+  href="../../cache/resources/etag-200-different.php?type=css&empty-after-revalidate-css"
   rel="stylesheet"
   integrity="sha256-YsI40D9FX0QghiYVdxQyySP2TOmARkLC5uPRO8RL2dE="
   onload="t_css.step_timeout(revalidate_css, 0)"

third_party/blink/web_tests/http/tests/security/subresourceIntegrity/revalidation-succeeded-css.html

@@ -14,12 +14,12 @@
     link.onload = t_css.step_func_done();
     link.onerror = t_css.unreached_func('Second request should pass');
     link.href =
-      "../../cache/resources/etag.php?empty-after-revalidate-css";
+      "../../cache/resources/etag.php?type=css&empty-after-revalidate-css";
     document.head.appendChild(link);
   }
 </script>
 <link
-  href="../../cache/resources/etag.php?empty-after-revalidate-css"
+  href="../../cache/resources/etag.php?type=css&empty-after-revalidate-css"
   rel="stylesheet"
   integrity="sha256-tbudgBSg+bHWHiHnlteNzN8TUvI80ygS9IULh4rklEw="
   onload="t_css.step_timeout(revalidate_css, 0)"