Garbage Collect the Storage directory on next profile start after an extension uninstall.

chrome/browser/extensions/extension_prefs.cc

Index: chrome/browser/extensions/extension_prefs.cc
diff --git a/chrome/browser/extensions/extension_prefs.cc b/chrome/browser/extensions/extension_prefs.cc
index 13029a92f255543feb3f7bb625f4a49336464c04..0bd4c713fcad438d758e259c6098096d3fca00fa 100644
--- a/chrome/browser/extensions/extension_prefs.cc
+++ b/chrome/browser/extensions/extension_prefs.cc
@@ -1819,7 +1819,7 @@ bool ExtensionPrefs::GetSideloadWipeoutDone() const {
 }
 
 void ExtensionPrefs::SetSideloadWipeoutDone() {
-  return prefs_->SetBoolean(kSideloadWipeoutDone, true);
+  prefs_->SetBoolean(kSideloadWipeoutDone, true);
 }
 
 bool ExtensionPrefs::WasAppDraggedByUser(const std::string& extension_id) {
@@ -2198,6 +2198,14 @@ void ExtensionPrefs::Init(bool extensions_disabled) {
   content_settings_store_->AddObserver(this);
 }
 
+void ExtensionPrefs::SetNeedsStorageGarbageCollection(bool value) {
+  prefs_->SetBoolean(prefs::kExtensionStorageGarbageCollect, value);
+}
+
+bool ExtensionPrefs::NeedsStorageGarbageCollection() {
+  return prefs_->GetBoolean(prefs::kExtensionStorageGarbageCollect);
+}
+
 // static
 void ExtensionPrefs::RegisterUserPrefs(PrefService* prefs) {
   prefs->RegisterDictionaryPref(kExtensionsPref, PrefService::UNSYNCABLE_PREF);
@@ -2221,6 +2229,9 @@ void ExtensionPrefs::RegisterUserPrefs(PrefService* prefs) {
   prefs->RegisterStringPref(prefs::kExtensionBlacklistUpdateVersion,
                             "0",  // default value
                             PrefService::UNSYNCABLE_PREF);
+  prefs->RegisterBooleanPref(prefs::kExtensionStorageGarbageCollect,
+                             false,  // default value
+                             PrefService::UNSYNCABLE_PREF);
   prefs->RegisterInt64Pref(prefs::kLastExtensionsUpdateCheck,
                            0,  // default value
                            PrefService::UNSYNCABLE_PREF);