[NaCl SDK] Remove create_nmf dependency on NACL_SDK_ROOT env var

[NaCl SDK] Remove create_nmf dependency on NACL_SDK_ROOT env var

create_nmf should determine the root of the SDK relative
to its own location.

The exception to this is when its run as part of the
chrome build, when it is not yet installed.  In this
case we pass --no-default-libpath and --objdump to
create_nmf to remove any use of the SDK root.

Committed: https://crrev.com/088561ac99314a79866a39f79bb32bd5e1196217
Cr-Commit-Position: refs/heads/master@{#313957}

[Sam Clegg, 2014-11-18 00:35:15]

sbc@chromium.org changed reviewers:
+ binji@chromium.org

[binji, 2014-11-18 00:39:54]

nice! lgtm

[Sam Clegg, 2014-11-18 18:13:04]

The CQ bit was checked by sbc@chromium.org

[commit-bot: I haz the power, 2014-11-18 18:14:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/737653003/40001

[commit-bot: I haz the power, 2014-11-18 18:17:52]

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

[commit-bot: I haz the power, 2014-11-18 18:17:53]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[Sam Clegg, 2015-01-30 01:21:48]

The CQ bit was checked by sbc@chromium.org

[commit-bot: I haz the power, 2015-01-30 01:22:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/737653003/80001

[commit-bot: I haz the power, 2015-01-30 01:29:44]

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

[commit-bot: I haz the power, 2015-01-30 01:29:45]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[Sam Clegg, 2015-01-30 01:46:49]

sbc@chromium.org changed reviewers:
+ dmichael@chromium.org

[Sam Clegg, 2015-01-30 01:46:50]

+dmichael for ppapi/

[dmichael (off chromium), 2015-01-30 16:28:51]

ppapi lgtm

[Sam Clegg, 2015-01-30 19:06:04]

The CQ bit was checked by sbc@chromium.org

[commit-bot: I haz the power, 2015-01-30 19:07:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/737653003/80001

[commit-bot: I haz the power, 2015-01-30 19:12:00]

Committed patchset #5 (id:80001)

[commit-bot: I haz the power, 2015-01-30 19:14:31]

Patchset 5 (id:??) landed as
https://crrev.com/088561ac99314a79866a39f79bb32bd5e1196217
Cr-Commit-Position: refs/heads/master@{#313957}

[please use gerrit instead, 2015-01-30 19:34:32]

A revert of this CL (patchset #5 id:80001) has been created in
https://codereview.chromium.org/890033003/ by rouslan@chromium.org.

The reason for reverting is: Broke compile on Google Chrome ChromeOS bot.

[8069/19495] CXX
obj/components/policy/core/common/cloud/policy_component_common.external_policy_data_updater.o
FAILED: cd ../../third_party/liblouis; python
../../native_client_sdk/src/tools/create_nmf.py
../../out/Release/chromevox_test_data/braille/liblouis_nacl_x86_64.nexe
"--output=../../out/Release/chromevox_test_data/braille/liblouis_nacl.nmf"
Traceback (most recent call last):
  File "../../native_client_sdk/src/tools/create_nmf.py", line 680, in <module>
    rtn = main(sys.argv[1:])
  File "../../native_client_sdk/src/tools/create_nmf.py", line 633, in main
    options.lib_path += GetDefaultLibPath(config)
  File "../../native_client_sdk/src/tools/create_nmf.py", line 507, in
GetDefaultLibPath
    sdk_root = GetSDKRoot()
  File "../../native_client_sdk/src/tools/create_nmf.py", line 478, in
GetSDKRoot
    assert(os.path.exists(os.path.join(sdk_root, 'toolchain')))
AssertionError
ninja: build stopped: subcommand failed.

http://build.chromium.org/p/chromium.chrome/builders/Google%20Chrome%20Chrome....