Bug 1023201 - Screenshots are missing 1px in height. r=fabrice
Bug 1032180 - [dolphin] No boot animation when restart the phone. r=mwu
Bug 1042463 - "System Update Ready" prompt keeps coming back and remind me battery is not 50% charged. r=fabrice
Bug 1053185 - Define DIST_SUBDIR for Mulet. r=mshal

Due to the way preferences are read, we need to have firefox.js and
b2g.js to be living together in the same directory, as exposed in bug
1053185 comment 7. Doing so will ensure that the proper precedence is
given to the pref and in the end we ensure that the preferences we
redefine in b2g.js indeed overwrite those defined by firefox.js. To do
so, we need to define DIST_SUBDIR to browser for Mulet so that rules.mk
will pick up the proper preferences directory.
Bug 1056034 - Avoid unassigned lastUpdateTime use. r=rstrong

Scope of 'let' variables is limited to the current block, however, there
is a later use of this variable that is done outside of the block where
it's declared as 'var'. We declare the variable as 'var' and at the top
level of the function to make sure that it is a legit one when we want
to assign it.