arc: Stop recording obsolete UMA metrics

The Arc.IntentHandler* metrics have been replaced with
ChromeOS.Apps.IntentPicker* months ago.

BUG=824598
TEST=try

Change-Id: I4d86f17c4a1f5529e6bf063837b75a48564bc378
Reviewed-on: https://chromium-review.googlesource.com/1234860
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592644}

chrome/browser/chromeos/apps/intent_helper/apps_navigation_throttle.cc

@@ -228,12 +228,6 @@ void AppsNavigationThrottle::RecordUma(const std::string& selected_app_package,
   PickerAction action = GetPickerAction(app_type, close_reason, should_persist);
   Platform platform = GetDestinationPlatform(selected_app_package, action);
 
-  // TODO(crbug.com/824598): stop recording this histogram in M70.
-  UMA_HISTOGRAM_ENUMERATION("Arc.IntentHandlerAction", action);
-
-  // TODO(crbug.com/824598): stop recording this histogram in M70.
-  UMA_HISTOGRAM_ENUMERATION("Arc.IntentHandlerDestinationPlatform", platform);
-
   UMA_HISTOGRAM_ENUMERATION("ChromeOS.Apps.IntentPickerAction", action);
 
   UMA_HISTOGRAM_ENUMERATION("ChromeOS.Apps.IntentPickerDestinationPlatform",

tools/metrics/histograms/enums.xml

@@ -1639,6 +1639,9 @@ uploading your change for review.  These are checked by presubmit scripts.
 </enum>
 
 <enum name="ArcIntentHandlerAction">
+  <obsolete>
+    Deprecated as of 9/2018 (M71).
+  </obsolete>
   <summary>Defines Arc intent handler actions</summary>
   <int value="0" label="Error"/>
   <int value="1" label="Dialog deactivated"/>
@@ -1653,6 +1656,9 @@ uploading your change for review.  These are checked by presubmit scripts.
 </enum>
 
 <enum name="ArcIntentHandlerDestinationPlatform">
+  <obsolete>
+    Deprecated as of 9/2018 (M71).
+  </obsolete>
   <summary>
     Defines ARC intent handler platforms to continue the navigation.
   </summary>