Add MobileUsingMenuBy* metric actions owner and remove an unused one.

tools/metrics/actions/actions.xml

Index: tools/metrics/actions/actions.xml
diff --git a/tools/metrics/actions/actions.xml b/tools/metrics/actions/actions.xml
index 0560f48e6b3b977f8429195de5808fecc2b3e336..3523bfb55c741b8395d51edf937aeaf6c0544297 100644
--- a/tools/metrics/actions/actions.xml
+++ b/tools/metrics/actions/actions.xml
@@ -7538,24 +7538,25 @@ should be able to be added at any place in this file.
   <description>Please enter the description of this user action.</description>
 </action>
 
-<action name="MobileUsingMenuByHwButtonDragging">

[Alexei Svitkine (slow), 2014/08/08 15:20:49]

Please keep this action since we have samples on it on the dashboard. (Even if
you choose to remove it from the code, it should still be kept in this file and
marked obsolete.)

[Kibeom Kim (inactive), 2014/08/08 18:29:15]

I removed HW menu dragging recently, https://codereview.chromium.org/319943003/
should we still keep this action here and mark it obsolete?

[Alexei Svitkine (slow), 2014/08/08 18:31:44]

Yes, please.

[Kibeom Kim (inactive), 2014/08/08 18:44:06]

Done.

-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
-  <description>Please enter the description of this user action.</description>
-</action>
-
 <action name="MobileUsingMenuByHwButtonTap">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
-  <description>Please enter the description of this user action.</description>
+  <owner>kkimlabs@chromium.org</owner>
+  <description>
+    Only for Android. Menu is shown by tapping hardware menu button.
+  </description>
 </action>
 
 <action name="MobileUsingMenuBySwButtonDragging">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
-  <description>Please enter the description of this user action.</description>
+  <owner>kkimlabs@chromium.org</owner>
+  <description>
+    Only for Android. Menu is shown by dragging from software menu button.
+  </description>
 </action>
 
 <action name="MobileUsingMenuBySwButtonTap">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
-  <description>Please enter the description of this user action.</description>
+  <owner>kkimlabs@chromium.org</owner>
+  <description>
+    Only for Android. Menu is shown by tapping software menu button.
+  </description>
 </action>
 
 <action name="MostVisited0">