Bug 1529379 - Remove devtools.inspector.changes.enabled pref. r=gl

devtools/client/inspector/changes/test/head.js

@@ -20,13 +20,10 @@ Services.scriptloader.loadSubScript(
   "chrome://mochitests/content/browser/devtools/client/shared/test/shared-redux-head.js",
   this);
 
-// Ensure the Changes panel is enabled before running the tests.
-Services.prefs.setBoolPref("devtools.inspector.changes.enabled", true);
 // Ensure the three-pane mode is enabled before running the tests.
 Services.prefs.setBoolPref("devtools.inspector.three-pane-enabled", true);
 
 registerCleanupFunction(() => {
-  Services.prefs.clearUserPref("devtools.inspector.changes.enabled");
   Services.prefs.clearUserPref("devtools.inspector.three-pane-enabled");
 });
 

devtools/client/inspector/inspector.js

@@ -55,7 +55,6 @@ const THREE_PANE_ENABLED_PREF = "devtools.inspector.three-pane-enabled";
 const THREE_PANE_ENABLED_SCALAR = "devtools.inspector.three_pane_enabled";
 const THREE_PANE_CHROME_ENABLED_PREF = "devtools.inspector.chrome.three-pane-enabled";
 const TELEMETRY_EYEDROPPER_OPENED = "devtools.toolbar.eyedropper.opened";
-const TRACK_CHANGES_PREF = "devtools.inspector.changes.enabled";
 
 /**
  * Represents an open instance of the Inspector for a tab.
@@ -245,8 +244,7 @@ Inspector.prototype = {
     // The changes actor was introduced in Fx65, we are checking this for backward
     // compatibility when connecting to an older server. Can be removed once Fx65 hit the
     // release channel.
-    return this._target.hasActor("changes") &&
-      Services.prefs.getBoolPref(TRACK_CHANGES_PREF);
+    return this._target.hasActor("changes");
   },
 
   /**

devtools/client/preferences/devtools-client.js

@@ -52,8 +52,6 @@ pref("devtools.inspector.showAllAnonymousContent", false);
 pref("devtools.inspector.showUserAgentShadowRoots", false);
 // Enable the font highlight-on-hover feature
 pref("devtools.inspector.fonthighlighter.enabled", true);
-// Enable tracking of style changes and the Changes panel in the Inspector
-pref("devtools.inspector.changes.enabled", true);
 // Enable the new Rules View
 pref("devtools.inspector.new-rulesview.enabled", false);