Bug 1883278 - Remove browser.sessionstore.collect_session_storage and browser.sessionstore.collect_zoom. r=farre,sessionstore-reviewers

These prefs don't do anything unless browser.sessionstore.platform_collection is
enabled, but we don't need the granularity that they provide. Let's just use
have the one  browser.sessionstore.platform_collection pref control everything.

Differential Revision: https://phabricator.services.mozilla.com/D203374

browser/app/profile/firefox.js

@@ -1300,8 +1300,6 @@ pref("browser.sessionstore.upgradeBackup.maxUpgradeBackups", 3);
 pref("browser.sessionstore.debug", false);
 // Forget closed windows/tabs after two weeks
 pref("browser.sessionstore.cleanup.forget_closed_after", 1209600000);
-// Platform collects session storage data for session store
-pref("browser.sessionstore.collect_session_storage", true);
 
 // temporary pref that will be removed in a future release, see bug 1836952
 pref("browser.sessionstore.persist_closed_tabs_between_sessions", true);

docshell/base/CanonicalBrowsingContext.cpp

@@ -2579,11 +2579,6 @@ nsresult CanonicalBrowsingContext::WriteSessionStorageToSessionStore(
 
 void CanonicalBrowsingContext::UpdateSessionStoreSessionStorage(
     const std::function<void()>& aDone) {
-  if (!StaticPrefs::browser_sessionstore_collect_session_storage_AtStartup()) {
-    aDone();
-    return;
-  }
-
   using DataPromise = BackgroundSessionStorageManager::DataPromise;
   BackgroundSessionStorageManager::GetData(
       this, StaticPrefs::browser_sessionstore_dom_storage_limit(),

modules/libpref/init/StaticPrefList.yaml

@@ -1665,18 +1665,6 @@
 #endif
   mirror: once
 
-# Platform collection of session storage data for session store
-- name: browser.sessionstore.collect_session_storage
-  type: bool
-  value: @IS_NOT_ANDROID@
-  mirror: once
-
-# Platform collection of zoom data for session store
-- name: browser.sessionstore.collect_zoom
-  type: bool
-  value: @IS_NOT_ANDROID@
-  mirror: once
-
 # Causes SessionStore to ignore non-final update messages from
 # browser tabs that were not caused by a flush from the parent.
 # This is a testing flag and should not be used by end-users.

toolkit/components/sessionstore/SessionStoreChangeListener.cpp

@@ -356,9 +356,7 @@ void SessionStoreChangeListener::AddEventListeners() {
   if (EventTarget* target = GetEventTarget()) {
     target->AddSystemEventListener(kInput, this, false);
     target->AddSystemEventListener(kScroll, this, false);
-    if (StaticPrefs::browser_sessionstore_collect_zoom_AtStartup()) {
-      target->AddSystemEventListener(kResize, this, false);
-    }
+    target->AddSystemEventListener(kResize, this, false);
     mCurrentEventTarget = target;
   }
 }
@@ -367,9 +365,7 @@ void SessionStoreChangeListener::RemoveEventListeners() {
   if (mCurrentEventTarget) {
     mCurrentEventTarget->RemoveSystemEventListener(kInput, this, false);
     mCurrentEventTarget->RemoveSystemEventListener(kScroll, this, false);
-    if (StaticPrefs::browser_sessionstore_collect_zoom_AtStartup()) {
-      mCurrentEventTarget->RemoveSystemEventListener(kResize, this, false);
-    }
+    mCurrentEventTarget->RemoveSystemEventListener(kResize, this, false);
   }
 
   mCurrentEventTarget = nullptr;