Bug 1324865 - Remove the FX_STARTUP_EXTERNAL_CONTENT_HANDLER telemetry probe now that it is expired. r=rstrong

MozReview-Commit-ID: 7bQQadOJIhL

--HG--
extra : rebase_source : f4324dac478d2b86097de934ef99ef4077bbcc46

browser/components/nsBrowserContentHandler.js

@@ -697,18 +697,6 @@ nsDefaultCommandLineHandler.prototype = {
 
   /* nsICommandLineHandler */
   handle : function dch_handle(cmdLine) {
-    // The -url flag is inserted by the operating system when the default
-    // application handler is used. We check for default browser to remove
-    // instances where users explicitly decide to "open with" the browser.
-    // Note that users who launch firefox manually with the -url flag will
-    // get erroneously counted.
-    try {
-      if (cmdLine.findFlag("url", false) &&
-          ShellService.isDefaultBrowser(false, false)) {
-        Services.telemetry.getHistogramById("FX_STARTUP_EXTERNAL_CONTENT_HANDLER").add();
-      }
-    } catch (e) {}
-
     var urilist = [];
 
     if (AppConstants.platform == "win") {

toolkit/components/telemetry/Histograms.json

@@ -5252,13 +5252,6 @@
     "releaseChannelCollection": "opt-out",
     "description": "Whether the browser we migrated from was the browser with the most recent data. Keyed by that browser's identifier (e.g. 'ie', 'edge', 'safari', etc.)."
   },
-  "FX_STARTUP_EXTERNAL_CONTENT_HANDLER": {
-    "bug_numbers": [1276027],
-    "alert_emails": ["jaws@mozilla.com"],
-    "expires_in_version": "53",
-    "kind": "count",
-    "description": "Count how often the browser is opened as an external app handler. This is generally used when the browser is set as the default browser."
-  },
   "INPUT_EVENT_RESPONSE_MS": {
     "alert_emails": ["perf-telemetry-alerts@mozilla.com"],
     "bug_numbers": [1235908],