Revert r13667: "Re-enable use of Goma on Windows, except when using the PNaCl toolchain"
Revert r13667: "Re-enable use of Goma on Windows, except when using the PNaCl toolchain"

This change failed when rolled into Chromium.  It started producing
the following Python traceback:

Traceback (most recent call last):
  File "../native_client/build/build_nexe.py", line 1118, in <module>
    sys.exit(Main(sys.argv))
  File "../native_client/build/build_nexe.py", line 1061, in CompileThread
    output_queue.put(build.Compile(filename))
  File "../native_client/build/build_nexe.py", line 639, in Compile
    self.CleanOutput(outd)
  File "../native_client/build/build_nexe.py", line 458, in CleanOutput
    RemoveFile(out)
  File "../native_client/build/build_nexe.py", line 63, in RemoveFile
    os.remove(FixPath(path))
WindowsError

Note that the CompileThread() code path is conditional on
"build.gomacc".  Presumably this is trying to remove a file that is
currently open, which usually fails on Windows.

> Re-enable use of Goma on Windows, except when using the PNaCl toolchain
>
> Goma does not work fully for PNaCl on Windows.
>
> Since Goma expects Cygwin-like path is used on Windows,
> it will generate wrong debug information if it is not true.
> To avoid to use wrong debug information, let me disable Goma
> on such a case.
>
> BUG=390764
>
> Review URL: https://codereview.chromium.org/495733003

BUG=https://code.google.com/p/chromium/issues/detail?id=390764
TEST=none
TBR=yyanagisawa@chromium.org

Review URL: https://codereview.chromium.org/523473002

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@13675 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client