Improve the handling of mock screen orientation for layout tests.

content/public/test/layouttest_support.h

Index: content/public/test/layouttest_support.h
diff --git a/content/public/test/layouttest_support.h b/content/public/test/layouttest_support.h
index ada075b8f4c6875bf5483831c17aedf693f6a00e..9503e3e7bfbc8c8db429a642f866c0823a0ad0fa 100644
--- a/content/public/test/layouttest_support.h
+++ b/content/public/test/layouttest_support.h
@@ -57,8 +57,7 @@ void SetMockDeviceMotionData(const blink::WebDeviceMotionData& data);
 // a listener through WebKitPlatformSupport::setDeviceOrientationListener().
 void SetMockDeviceOrientationData(const blink::WebDeviceOrientationData& data);
 
-// Sets WebScreenOrientation that should be used when registering a listener
-// through WebKitPlatformSupport::setScreenOrientationListener().
+// Sets WebScreenOrientationType that should be used as a mock orientation.
 void SetMockScreenOrientation(
     const blink::WebScreenOrientationType& orientation);