Drop support for buildtools/linux32 in the GN wrapper.

Since we no longer have a 32-bit Linux GN binary, we shouldn't
try to point to one in the gn.py wrapper; this was hiding a
bug on one of the NaCl bots.

R=brettw@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1152163008

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@295520 0039d316-1c4b-4281-b951-d872f2087c98

gclient_utils.py

@@ -708,8 +708,6 @@ def GetBuildtoolsPath():
 
 def GetBuildtoolsPlatformBinaryPath():
   """Returns the full path to the binary directory for the current platform."""
-  # Mac and Windows just have one directory, Linux has two according to whether
-  # it's 32 or 64 bits.
   buildtools_path = GetBuildtoolsPath()
   if not buildtools_path:
     return None
@@ -719,10 +717,7 @@ def GetBuildtoolsPlatformBinaryPath():
   elif sys.platform == 'darwin':
     subdir = 'mac'
   elif sys.platform.startswith('linux'):
-    if sys.maxsize > 2**32:
       subdir = 'linux64'
-    else:
-      subdir = 'linux32'
   else:
     raise Error('Unknown platform: ' + sys.platform)
   return os.path.join(buildtools_path, subdir)