Fix race condition in gyp/ninja builds.

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
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=282118

[Andrew Hayden (chromium.org), 2014-07-09 14:21:46]

LGTM!

[simonb (inactive), 2014-07-09 14:52:29]

The CQ bit was checked by simonb@chromium.org

[commit-bot: I haz the power, 2014-07-09 14:53:09]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/simonb@chromium.org/376193003/1

[commit-bot: I haz the power, 2014-07-09 15:18:36]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_chromium_gn_compile_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_chromium_gn_c...)
  chromium_presubmit on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/chromium_presubmit/bu...)
  ios_dbg_simulator on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/ios_dbg_simulator/bui...)
  ios_rel_device on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/ios_rel_device/builds...)
  ios_rel_device_ninja on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/ios_rel_device_ninja/...)
  linux_chromium_chromeos_clang_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_chrome...)
  linux_chromium_chromeos_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_chrome...)
  linux_chromium_clang_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_clang_...)
  linux_chromium_gn_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_gn_rel...)
  linux_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_rel/bu...)
  mac_chromium_compile_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/mac_chromium_compile_...)
  mac_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/mac_chromium_rel/buil...)
  win8_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win8_chromium_rel/bui...)
  win_chromium_compile_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_compile_...)
  win_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_rel/buil...)
  win_chromium_x64_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_x64_rel/...)
  linux_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/linux_gpu/builds/...)
  mac_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu/builds/26482)
  win_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu/builds/30921)

[commit-bot: I haz the power, 2014-07-09 15:19:54]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-07-09 15:19:54]

Try jobs failed on following builders:
  ios_rel_device_ninja on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/ios_rel_device_ninja/...)
  mac_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu/builds/26495)

[Andrew Hayden (chromium.org), 2014-07-09 16:28:27]

LGTM again!

[simonb (inactive), 2014-07-09 16:28:39]

The CQ bit was checked by simonb@chromium.org

[commit-bot: I haz the power, 2014-07-09 16:29:29]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/simonb@chromium.org/376193003/40001

[commit-bot: I haz the power, 2014-07-09 20:51:26]

Change committed as 282118