[CB-2058] [iOS] 2 File API test failures on mobile-spec 2.3.0rc2

Clobber and then merge instead of the other way around.
iOS was depending on this ordering, and it makes more sense anyways.

lib/scripts/bootstrap.js

@@ -41,12 +41,12 @@
 
                     // Drop the common globals into the window object, but be nice and don't overwrite anything.
                     builder.buildIntoButDoNotClobber(base.defaults, context);
-                    builder.buildIntoAndMerge(base.merges, context);
                     builder.buildIntoAndClobber(base.clobbers, context);
+                    builder.buildIntoAndMerge(base.merges, context);
 
                     builder.buildIntoButDoNotClobber(platform.defaults, context);
-                    builder.buildIntoAndMerge(platform.merges, context);
                     builder.buildIntoAndClobber(platform.clobbers, context);
+                    builder.buildIntoAndMerge(platform.merges, context);
 
                     // Call the platform-specific initialization
                     platform.initialize();