Fix race condition in gyp/ninja builds.
A race can exist where two build targets build the same libchrome. It
can manifest as:
.../arm-linux-androideabi-objcopy: error: the input file '.../libchrome.2085.0.so' is empty
Move the temporary directory used to transfer stripped files between the
strip and pack actions from <(SHARED_INTERMEDIATE_DIR) to <(intermediate_dir).
Also, remove nugatory inter-action dependency, and make actions previously
consuming <(strip_stamp) consume <(pack_arm_relocations_stamp) instead.
BUG=392417
Review URL: https://codereview.chromium.org/
376193003
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282118 0039d316-1c4b-4281-b951-d872f2087c98