Revert of Linux sandbox: add sandbox_linux_unittests.isolate (https://codereview...

Revert of Linux sandbox: add sandbox_linux_unittests.isolate (https://codereview.chromium.org/340523006/)

Reason for revert:
Breaking linux_chromium_clang_dbg

[7609/24970 | 449.637] SOLINK lib/libmojo_launcher.so
FAILED: cd ../../sandbox; python ../tools/isolate_driver.py check --isolated "../out/Debug/sandbox_linux_unittests.isolated" --isolate "linux/sandbox_linux_unittests.isolate" --path-variable DEPTH .. --path-variable PRODUCT_DIR "../out/Debug " --extra-variable "version_full=37.0.2056.0" --config-variable "OS=linux" --config-variable "chromeos=0" --config-variable "component=shared_library" --config-variable "internal_gles2_conform_tests=0" --config-variable "icu_use_data_file_flag=1" --config-variable "libpeer_target_type=static_library" --config-variable "use_openssl=0" --ignore_broken_items
Traceback (most recent call last):
  File "../tools/isolate_driver.py", line 279, in <module>
    sys.exit(main())
  File "../tools/isolate_driver.py", line 269, in main
    create_wrapper(args, isolate, isolated)
  File "../tools/isolate_driver.py", line 194, in create_wrapper
    assert os.path.basename(isolate) == isolate, isolate
AssertionError: linux/sandbox_linux_unittests.isolate
ninja: build stopped: subcommand failed.

Original issue's description:
> Linux sandbox: add sandbox_linux_unittests.isolate
>
> BUG=384514
> NOTRY=true
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=277867

TBR=nodir@chromium.org,vadimsh@chromium.org,maruel@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=384514

Review URL: https://codereview.chromium.org/339183007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@277875 0039d316-1c4b-4281-b951-d872f2087c98