headless: Make HeadlessBrowser::Options move-only

headless/test/headless_test_launcher.cc

Index: headless/test/headless_test_launcher.cc
diff --git a/headless/test/headless_test_launcher.cc b/headless/test/headless_test_launcher.cc
index 13e4f6c9d305203b6cbb6aa6096c9c6662379274..da4550052cd018b321a97118501b4dcb73544369 100644
--- a/headless/test/headless_test_launcher.cc
+++ b/headless/test/headless_test_launcher.cc
@@ -18,10 +18,10 @@ namespace {
 
 class HeadlessBrowserImplForTest : public HeadlessBrowserImpl {
  public:
-  explicit HeadlessBrowserImplForTest(const HeadlessBrowser::Options& options)
+  explicit HeadlessBrowserImplForTest(HeadlessBrowser::Options options)
       : HeadlessBrowserImpl(base::Bind(&HeadlessBrowserImplForTest::OnStart,
                                        base::Unretained(this)),
-                            options) {}
+                            std::move(options)) {}
 
   void OnStart(HeadlessBrowser* browser) { EXPECT_EQ(this, browser); }