Convert from using env['PLATFORM'] directly to using the more flexible...

build/SConscript.v8

 # Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import os
 
 Import('env')
 
 if not env.Dir('$CHROME_SRC_DIR/v8').exists():
   Return()
@@ skipping 38 matching lines @@
     '$V8_MODE_DIR/mksnapshot${PROGSUFFIX}',
     '$V8_MODE_DIR/libraries${OBJSUFFIX}',
     '$V8_MODE_DIR/snapshot-empty${OBJSUFFIX}',
 ]
 
 v8_scons_targets_on = [
     '$V8_MODE_DIR/libraries-empty${OBJSUFFIX}',
     '$V8_MODE_DIR/snapshot${OBJSUFFIX}',
 ]
 
-if env['PLATFORM'] == 'win32':
+if env.Bit('windows'):
   v8_scons_targets_off.extend([
       env.File('$V8_DIR/vc80.pdb')
   ])
 
 v8 = env.Command(v8_scons_targets_off + v8_scons_targets_on,
                  [],
                  ['$V8_SCONS_COM snapshot=off sample=shell',
                   '$V8_SCONS_COM snapshot=on ${TARGETS[-%d:].abspath}'
                       % len(v8_scons_targets_on)])
 env.AlwaysBuild(v8)
 
 # Tell our SCons invocation to *not* delete v8.lib and the other targets
 # before building them, so the subsidiary v8 SCons call doesn't always
 # rebuild them (thereby causing us to always rebuild their dependents).
 env.Precious(v8)
 
 
 env.Install('$TARGET_ROOT', v8[0])
 env.Install('$LIBS_DIR', v8[1])
 env.Install('$V8_DIR', '$V8_MODE_DIR/snapshot-empty${OBJSUFFIX}')
 
 # To satisfy tests expecting the following .exe name.
-if env['PLATFORM'] == 'win32':
+if env.Bit('windows'):
   # TODO(evanm): this may be necessary on other platforms(?)
   i = env.InstallAs('$TARGET_ROOT/v8_shell_sample${PROGSUFFIX}', v8[0])
 
 env.ChromeStaticLibrary('v8_snapshot',
                         ['$V8_MODE_DIR/libraries-empty${OBJSUFFIX}',
                          '$V8_MODE_DIR/snapshot${OBJSUFFIX}'])