Bug 1562305 - Remove browser.cache.compression_level pref. r=michal

It's unused.

Differential Revision: https://phabricator.services.mozilla.com/D37191

--HG--
extra : moz-landing-system : lando

mobile/android/app/mobile.js

@@ -80,9 +80,6 @@ pref("offline-apps.quota.warn", 1024); // kilobytes
 // Automatically shrink-to-fit image documents.
 pref("browser.enable_automatic_image_resizing", true);
 
-// cache compression turned off for now - see bug #715198
-pref("browser.cache.compression_level", 0);
-
 /* disable some protocol warnings */
 pref("network.protocol-handler.warn-external.tel", false);
 pref("network.protocol-handler.warn-external.sms", false);

modules/libpref/init/all.js

@@ -55,13 +55,6 @@ pref("browser.cache.offline.capacity",         512000);
 // (in kilobytes)
 pref("offline-apps.quota.warn",        51200);
 
-// zlib compression level used for cache compression:
-// 0 => disable compression
-// 1 => best speed
-// 9 => best compression
-// cache compression turned off for now - see bug #715198
-pref("browser.cache.compression_level", 0);
-
 // Don't show "Open with" option on download dialog if true.
 pref("browser.download.forbid_open_with", false);
 

netwerk/cache2/CacheObserver.cpp

@@ -33,9 +33,6 @@ static uint32_t const kDefaultDiskCacheCapacity = 250 * 1024;  // 250 MB
 Atomic<uint32_t, Relaxed> CacheObserver::sDiskCacheCapacity(
     kDefaultDiskCacheCapacity);
 
-static uint32_t const kDefaultCompressionLevel = 1;
-uint32_t CacheObserver::sCompressionLevel = kDefaultCompressionLevel;
-
 static bool kDefaultSanitizeOnShutdown = false;
 bool CacheObserver::sSanitizeOnShutdown = kDefaultSanitizeOnShutdown;
 
@@ -109,11 +106,6 @@ void CacheObserver::AttachToPreferences() {
                                               "browser.cache.disk.capacity",
                                               kDefaultDiskCacheCapacity);
 
-  // http://mxr.mozilla.org/mozilla-central/source/netwerk/cache/nsCacheEntryDescriptor.cpp#367
-  mozilla::Preferences::AddUintVarCache(&sCompressionLevel,
-                                        "browser.cache.compression_level",
-                                        kDefaultCompressionLevel);
-
   mozilla::Preferences::GetComplex(
       "browser.cache.disk.parent_directory", NS_GET_IID(nsIFile),
       getter_AddRefs(mCacheParentDirectoryOverride));

netwerk/cache2/CacheObserver.h

@@ -72,7 +72,6 @@ class CacheObserver : public nsIObserver, public nsSupportsWeakReference {
                      browser_cache_disk_max_priority_chunks_memory_usage()
                : StaticPrefs::browser_cache_disk_max_chunks_memory_usage();
   }
-  static uint32_t CompressionLevel() { return sCompressionLevel; }
   static uint32_t HalfLifeSeconds() { return sHalfLifeHours * 60.0F * 60.0F; }
   static bool ClearCacheOnShutdown() {
     return sSanitizeOnShutdown && sClearCacheOnShutdown;
@@ -111,7 +110,6 @@ class CacheObserver : public nsIObserver, public nsSupportsWeakReference {
 
   static int32_t sAutoMemoryCacheCapacity;
   static Atomic<uint32_t, Relaxed> sDiskCacheCapacity;
-  static uint32_t sCompressionLevel;
   static float sHalfLifeHours;
   static bool sSanitizeOnShutdown;
   static bool sClearCacheOnShutdown;