Make the TestServer use an absolute document root path.

chrome/browser/captive_portal/captive_portal_browsertest.cc

Index: chrome/browser/captive_portal/captive_portal_browsertest.cc
diff --git a/chrome/browser/captive_portal/captive_portal_browsertest.cc b/chrome/browser/captive_portal/captive_portal_browsertest.cc
index 47685bc79f5bf005af3a8fe52064ccb39399e912..52383d5b444a8228c3cfa909ba087ea5e4df9323 100644
--- a/chrome/browser/captive_portal/captive_portal_browsertest.cc
+++ b/chrome/browser/captive_portal/captive_portal_browsertest.cc
@@ -1561,7 +1561,7 @@ IN_PROC_BROWSER_TEST_F(CaptivePortalBrowserTest, HttpsIframeTimeout) {
   // Use an HTTPS server for the top level page.
   net::TestServer https_server(
       net::TestServer::TYPE_HTTPS, net::TestServer::kLocalhost,
-      base::FilePath(FILE_PATH_LITERAL("chrome/test/data")));
+      net::TestServer::GetTestDataPath());
   ASSERT_TRUE(https_server.Start());
 
   GURL url = https_server.GetURL(kTestServerIframeTimeoutPath);
@@ -1616,7 +1616,7 @@ IN_PROC_BROWSER_TEST_F(CaptivePortalBrowserTest, RedirectSSLCertError) {
       net::TestServer::SSLOptions::CERT_MISMATCHED_NAME;
   net::TestServer https_server(
       net::TestServer::TYPE_HTTPS, ssl_options,
-      base::FilePath(FILE_PATH_LITERAL("chrome/test/data")));
+      net::TestServer::GetTestDataPath());
   ASSERT_TRUE(https_server.Start());
 
   GURL ssl_login_url = https_server.GetURL(kTestServerLoginPath);
@@ -1704,7 +1704,7 @@ IN_PROC_BROWSER_TEST_F(CaptivePortalBrowserTest, SSLCertErrorLogin) {
       net::TestServer::SSLOptions::CERT_MISMATCHED_NAME;
   net::TestServer https_server(
       net::TestServer::TYPE_HTTPS, https_options,
-      base::FilePath(FILE_PATH_LITERAL("chrome/test/data")));
+      net::TestServer::GetTestDataPath());
   ASSERT_TRUE(https_server.Start());
 
   // The path does not matter.
@@ -2160,7 +2160,7 @@ IN_PROC_BROWSER_TEST_F(CaptivePortalBrowserTest, HttpsToHttpRedirect) {
   // Use an HTTPS server for the top level page.
   net::TestServer https_server(
       net::TestServer::TYPE_HTTPS, net::TestServer::kLocalhost,
-      base::FilePath(FILE_PATH_LITERAL("chrome/test/data")));
+      net::TestServer::GetTestDataPath());
   ASSERT_TRUE(https_server.Start());
 
   GURL http_timeout_url =