headless: Introduce a browser context

headless/lib/headless_web_contents_browsertest.cc

Index: headless/lib/headless_web_contents_browsertest.cc
diff --git a/headless/lib/headless_web_contents_browsertest.cc b/headless/lib/headless_web_contents_browsertest.cc
index 5cff88c0441b2529962893f61341be2272bb62e3..88700d95c23cbc3a773de186fd7f9858b105b54c 100644
--- a/headless/lib/headless_web_contents_browsertest.cc
+++ b/headless/lib/headless_web_contents_browsertest.cc
@@ -23,8 +23,11 @@ class HeadlessWebContentsTest : public HeadlessBrowserTest {};
 IN_PROC_BROWSER_TEST_F(HeadlessWebContentsTest, Navigation) {
   EXPECT_TRUE(embedded_test_server()->Start());
 
-  HeadlessWebContents* web_contents = browser()->CreateWebContents(
-      embedded_test_server()->GetURL("/hello.html"), gfx::Size(800, 600));
+  HeadlessWebContents* web_contents =
+      browser()
+          ->CreateWebContentsBuilder()
+          .SetInitialURL(embedded_test_server()->GetURL("/hello.html"))
+          .Build();
   EXPECT_TRUE(WaitForLoad(web_contents));
 
   std::vector<HeadlessWebContents*> all_web_contents =
@@ -37,8 +40,11 @@ IN_PROC_BROWSER_TEST_F(HeadlessWebContentsTest, Navigation) {
 IN_PROC_BROWSER_TEST_F(HeadlessWebContentsTest, WindowOpen) {
   EXPECT_TRUE(embedded_test_server()->Start());
 
-  HeadlessWebContents* web_contents = browser()->CreateWebContents(
-      embedded_test_server()->GetURL("/window_open.html"), gfx::Size(800, 600));
+  HeadlessWebContents* web_contents =
+      browser()
+          ->CreateWebContentsBuilder()
+          .SetInitialURL(embedded_test_server()->GetURL("/window_open.html"))
+          .Build();
   EXPECT_TRUE(WaitForLoad(web_contents));
 
   std::vector<HeadlessWebContents*> all_web_contents =