NaCl: Enable untrusted hardware exception handling by default

chrome/browser/nacl_host/nacl_process_host.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/nacl_host/nacl_process_host.h"
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 178 matching lines @@
       process_launched_by_broker_(false),
 #elif defined(OS_LINUX)
       wait_for_nacl_gdb_(false),
 #endif
       reply_msg_(NULL),
 #if defined(OS_WIN)
       debug_exception_handler_requested_(false),
 #endif
       internal_(new NaClInternal()),
       ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)),
-      enable_exception_handling_(false),
+      enable_exception_handling_(true),
       enable_debug_stub_(false),
       uses_irt_(uses_irt),
       off_the_record_(off_the_record),
       ALLOW_THIS_IN_INITIALIZER_LIST(ipc_plugin_listener_(this)),
       render_view_id_(render_view_id) {
   process_.reset(content::BrowserChildProcessHost::Create(
       PROCESS_TYPE_NACL_LOADER, this));
 
   // Set the display name so the user knows what plugin the process is running.
   // We aren't on the UI thread so getting the pref locale for language
   // formatting isn't possible, so IDN will be lost, but this is probably OK
   // for this use case.
   process_->SetName(net::FormatUrl(manifest_url_, std::string()));
 
-  // We allow untrusted hardware exception handling to be enabled via
-  // an env var for consistency with the standalone build of NaCl.
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableNaClExceptionHandling) ||
-      getenv("NACL_UNTRUSTED_EXCEPTION_HANDLING") != NULL) {
-    enable_exception_handling_ = true;
-  }
   enable_debug_stub_ = CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnableNaClDebug);
 }
 
 NaClProcessHost::~NaClProcessHost() {
   int exit_code;
   process_->GetTerminationStatus(&exit_code);
   std::string message =
       base::StringPrintf("NaCl process exited with status %i (0x%x)",
                          exit_code, exit_code);
@@ skipping 740 matching lines @@
   } else {
     NaClStartDebugExceptionHandlerThread(
         process_handle.Take(), info,
         base::MessageLoopProxy::current(),
         base::Bind(&NaClProcessHost::OnDebugExceptionHandlerLaunchedByBroker,
                    weak_factory_.GetWeakPtr()));
     return true;
   }
 }
 #endif