Deprecate SettingsAppMonitor.InitializationResult.

All signs indicate that it is exceptionally rare for initialization to
fail.

BUG=975750
R=pmonette@chromium.org,jwd@chromium.org

Change-Id: I5cee019454c882c9702d69d3c4877d7cda97d5a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1670889
Commit-Queue: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Patrick Monette <pmonette@chromium.org>
Auto-Submit: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672191}
diff --git a/chrome/browser/shell_integration_win.cc b/chrome/browser/shell_integration_win.cc
index 74b5b38..4ee45c5 100644
--- a/chrome/browser/shell_integration_win.cc
+++ b/chrome/browser/shell_integration_win.cc
@@ -249,8 +249,7 @@
  private:
   // win::SettingsAppMonitor::Delegate:
   void OnInitialized(HRESULT result) override {
-    UMA_HISTOGRAM_BOOLEAN("SettingsAppMonitor.InitializationResult",
-                          SUCCEEDED(result));
+    // UMA indicates that this succeeds > 99.98% of the time.
     if (SUCCEEDED(result)) {
       base::RecordAction(
           base::UserMetricsAction("SettingsAppMonitor.Initialized"));
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 59daf5e..56ff21c 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -120453,6 +120453,10 @@
 
 <histogram name="SettingsAppMonitor.InitializationResult" enum="BooleanSuccess"
     expires_after="M77">
+  <obsolete>
+    Deprecated 06/2019. All signs indicate that it is exceptionally rare for
+    initialization to fail.
+  </obsolete>
   <owner>grt@chromium.org</owner>
   <summary>
     Indicates whether or not the Windows Settings app monitor was initialized.