Get rid of AX_LINE_BREAKS attribute to improve performance.

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 42edb6b28e0e6dcac8d577249d3bf37c5064a178..8d9d827dad5411794d9e974ed234c3551aca5af3 100644
--- a/chrome/browser/extensions/api/automation/automation_apitest.cc
+++ b/chrome/browser/extensions/api/automation/automation_apitest.cc
@@ -138,6 +138,13 @@ IN_PROC_BROWSER_TEST_F(AutomationApiTest, BoundsForRange) {
       << message_;
 }
 
+IN_PROC_BROWSER_TEST_F(AutomationApiTest, LineStartOffsets) {
+  StartEmbeddedTestServer();
+  ASSERT_TRUE(
+      RunExtensionSubtest("automation/tests/tabs", "line_start_offsets.html"))
+      << message_;
+}
+
 IN_PROC_BROWSER_TEST_F(AutomationApiTest, TabsAutomationBooleanPermissions) {
   StartEmbeddedTestServer();
   ASSERT_TRUE(RunExtensionSubtest(