Remove some unnecessary preprocessing, no bug

--HG--
extra : rebase_source : 211b3d075040fa0ffdf64782c804f7a55f039149

testing/marionette/components/moz.build

@@ -4,7 +4,10 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-EXTRA_PP_COMPONENTS += [
-    'MarionetteComponents.manifest',
-    'marionettecomponent.js',
+EXTRA_COMPONENTS += [
+    'MarionetteComponents.manifest'
+]
+
+EXTRA_PP_COMPONENTS += [
+    'marionettecomponent.js'
 ]