Fix the doc comments for ui_test_pak.

ui/resources/ui_resources.gyp

Index: ui/resources/ui_resources.gyp
diff --git a/ui/resources/ui_resources.gyp b/ui/resources/ui_resources.gyp
index 7a26a83939c81c4b2af50447fd21410dc9321763..7ec8761c12a473c5b1609bffd62dfc0e8ad684f4 100644
--- a/ui/resources/ui_resources.gyp
+++ b/ui/resources/ui_resources.gyp
@@ -36,8 +36,8 @@
       'includes': [ '../../build/grit_target.gypi' ],
     },
     {
-      # We build a minimal set of resources so WebKit in content_shell has
-      # access to necessary resources.
+      # This creates a pak file that has the minimal set of resources necessary
+      # for tests.

[tony, 2013/11/22 22:57:32]

Nit: I would say, "This creates a pak file that contains the resources in
src/ui.  This pak file can be used by tests."

[tfarina, 2013/11/22 23:02:03]

Done.

       'target_name': 'ui_test_pak',
       'type': 'none',
       'dependencies': [