Rename Toolkit's webextensions component directory to better reflect what it is.

browser/configure.in

@@ -16,7 +16,7 @@ dnl Optional parts of the build.
 dnl ========================================================
 dnl = Disable WebExtensions
 dnl ========================================================
-MOZ_ARG_DISABLE_BOOL(browser-statusbar,
+MOZ_ARG_DISABLE_BOOL(webextensions,
 [  --disable-webextensions            Disable WebExtensions],
     MOZ_WEBEXTENSIONS=,
     MOZ_WEBEXTENSIONS=1)

toolkit/components/moz.build

@@ -25,7 +25,6 @@ DIRS += [
     'crashmonitor',
     'diskspacewatcher',
     'downloads',
-    'extensions',
     'exthelper',
     'filewatcher',
     'finalizationwitness',
@@ -68,6 +67,9 @@ DIRS += [
     'xulstore'
 ]
 
+if CONFIG['MOZ_WEBEXTENSIONS']:
+    DIRS += ['webextensions']
+
 if CONFIG['ENABLE_INTL_API']:
     DIRS += ['mozintl']