Revert "Disable kPowerBookmarksSidePanel feature flag"

This reverts commit 237341ebe2.

app/brave_main_delegate_browsertest.cc

@@ -204,7 +204,6 @@ IN_PROC_BROWSER_TEST_F(BraveMainDelegateBrowserTest, DisabledFeatures) {
     &features::kOmniboxTriggerForNoStatePrefetch,
     &features::kOmniboxTriggerForPrerender2,
     &features::kPerformanceSettingsPreloadingSubpage,
-    &features::kPowerBookmarksSidePanel,
     &features::kPrivacyGuide3,
 #if BUILDFLAG(IS_ANDROID)
     &features::kPrivacyGuideAndroidPostMVP,

chromium_src/chrome/browser/ui/ui_features.cc

@@ -12,12 +12,11 @@ namespace features {
 
 OVERRIDE_FEATURE_DEFAULT_STATES({{
     {kChromeLabs, base::FEATURE_DISABLED_BY_DEFAULT},
-    {kExtensionsMenuInAppMenu, base::FEATURE_DISABLED_BY_DEFAULT},
 #if !BUILDFLAG(IS_ANDROID)
     {kHaTSWebUI, base::FEATURE_DISABLED_BY_DEFAULT},
 #endif
-    {kPowerBookmarksSidePanel, base::FEATURE_DISABLED_BY_DEFAULT},
     {kTabHoverCardImages, base::FEATURE_DISABLED_BY_DEFAULT},
+    {kExtensionsMenuInAppMenu, base::FEATURE_DISABLED_BY_DEFAULT},
 }});
 
 }  // namespace features