Bug 1198955 - Remove `FENNEC_TITLE_IN_TITLEBAR_ENABLED` probe. r=ally

--HG--
extra : commitid : 3v3YSxFxWrs
extra : rebase_source : 365fc4f35a6ad594f0f5f47b6ab86cce0736c2d7

mobile/android/chrome/content/browser.js

@@ -605,13 +605,6 @@ var BrowserApp = {
         InitLater(() => WebcompatReporter.init());
       }
 
-      InitLater(function () {
-        // title == 0 and url == 1. See:
-        //   https://mxr.mozilla.org/mozilla-central/source/mobile/android/base/resources/values/arrays.xml?rev=861e4bd9e7fe#153
-        const titleInTitlebarEnabled = Services.prefs.getIntPref("browser.chrome.titlebarMode") == 0;
-        Telemetry.addData("FENNEC_TITLE_IN_TITLEBAR_ENABLED", titleInTitlebarEnabled);
-      });
-
       InitLater(() => LightWeightThemeWebInstaller.init());
       InitLater(() => SpatialNavigation.init(BrowserApp.deck, null), window, "SpatialNavigation");
       InitLater(() => CastingApps.init(), window, "CastingApps");

toolkit/components/telemetry/Histograms.json

@@ -8729,12 +8729,6 @@
     "kind": "flag",
     "description": "An Attr node that's not namespace-aware and was created from an HTML document is set on a non-HTML element and has a name containing uppercase ASCII chars"
   },
-  "FENNEC_TITLE_IN_TITLEBAR_ENABLED": {
-    "alert_emails": ["michael.l.comella@gmail.com"],
-    "expires_in_version": "43",
-    "kind": "boolean",
-    "description": "Is the title shown in the url bar (as determined by the titlebar title or url preference)?"
-  },
   "DEVTOOLS_HUD_JANK": {
     "expires_in_version": "never",
     "kind": "exponential",