Breakpad test: Fix test disabling logic to refer to the correct flag name

ppapi/native_client/tests/breakpad_crash_test/nacl.scons

Index: ppapi/native_client/tests/breakpad_crash_test/nacl.scons
diff --git a/ppapi/native_client/tests/breakpad_crash_test/nacl.scons b/ppapi/native_client/tests/breakpad_crash_test/nacl.scons
index 06c463205bcce454be1dfccb52cc497cbf9cc224..2dd6984fb901ee9e3be111b4142ceacac26c6bd4 100644
--- a/ppapi/native_client/tests/breakpad_crash_test/nacl.scons
+++ b/ppapi/native_client/tests/breakpad_crash_test/nacl.scons
@@ -42,19 +42,18 @@ if env.Bit('host_windows') or env.Bit('host_mac'):
                             '--expected_process_type=browser'])
   env.AddNodeToTestSuite(
       node, ['chrome_browser_tests'], 'run_breakpad_browser_process_crash_test',
-      # For some strange reason, this test fails on the second run
-      # (for the SRPC PPAPI proxy) on the Windows XP (32-bit)
-      # buildbots.  The failures modes are that the browser process
-      # hangs, or that a .dmp file is produced with no .txt file.
-      # Maybe there is a problem with the command line getting too
-      # long?
-      # TODO(mseaborn): Remove this when the "--enable-srpc-proxy"
+      # For some strange reason, this test sometimes fails on the
+      # second run (for the SRPC PPAPI proxy) on the Windows 32-bit
+      # and 64-bit buildbots.  The failure modes are that the browser
+      # process hangs, or that a .dmp file is produced with no .txt
+      # file.  Maybe there is a problem with the command line getting
+      # too long?
+      # TODO(mseaborn): Remove this when the "--enable-nacl-srpc-proxy"
       # option is removed, or investigate and fix.
       is_broken=(env.PPAPIBrowserTesterIsBroken() or
                  env.Bit('running_on_valgrind') or
                  (env.Bit('host_windows') and
-                  env.Bit('build_x86_32') and
-                  '--enable-srpc-proxy' in
+                  '--enable-nacl-srpc-proxy' in
                       os.environ.get('NACL_BROWSER_FLAGS', ''))))
 
 # This crash in trusted code should produce a crash dump.