Use multiline attribute to check for IA2_STATE_MULTILINE.

chrome/browser/extensions/api/automation/automation_apitest.cc

Index: chrome/browser/extensions/api/automation/automation_apitest.cc
diff --git a/chrome/browser/extensions/api/automation/automation_apitest.cc b/chrome/browser/extensions/api/automation/automation_apitest.cc
index af8b507313a34f8972c6ab0bea47b6ff646c85ed..fd4104c849ca26a1d049b6aa583b11a6ff2625e1 100644
--- a/chrome/browser/extensions/api/automation/automation_apitest.cc
+++ b/chrome/browser/extensions/api/automation/automation_apitest.cc
@@ -206,7 +206,7 @@ IN_PROC_BROWSER_TEST_F(AutomationApiTest, Find) {
 #else
 #define MAYBE_Mixins Mixins
 #endif
-IN_PROC_BROWSER_TEST_F(AutomationApiTest, DISABLED_Mixins) {
+IN_PROC_BROWSER_TEST_F(AutomationApiTest, Mixins) {
   StartEmbeddedTestServer();
   ASSERT_TRUE(RunExtensionSubtest("automation/tests/tabs", "mixins.html"))
       << message_;