Straight assignments to HierarchicalStringList, which we'll change
EXTRA_JS_MODULES to in a later patch, don't work. This change, in
addition to making things work as expected later on, also is more
consistent with existing practice.
Many moz.build files define things that could be defined in parent
moz.build files. Keeping the number of moz.build files low helps with
build times due to less I/O and fewer directories traversed.
This patch eliminates a lot of moz.build files by moving their content
into parent moz.build files.
--HG--
extra : rebase_source : 0cfdf2697d10532e5b03cd27fbaadb41f42b837c
extra : amend_source : 0119d4e4881217f105e0e4ba1dfa9c8f7295f3e9
extra : histedit_source : eb49e62c67af2005fdc08d9c9a07f56bee98d558%2C50951e960e450f9b0e48fc7e8ec369d8666a63b0