Continue to clean c_str() calls.

sandbox/linux/suid/client/setuid_sandbox_host.cc

 // Copyright 2015 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 "sandbox/linux/suid/client/setuid_sandbox_host.h"
 
 #include <fcntl.h>
 #include <stddef.h>
 #include <stdlib.h>
 #include <sys/stat.h>
@@ skipping 68 matching lines @@
   for (unsigned i = 0; kSUIDUnsafeEnvironmentVariables[i]; ++i) {
     const char* env_var = kSUIDUnsafeEnvironmentVariables[i];
     // Get the saved environment variable corresponding to envvar.
     std::unique_ptr<std::string> saved_env_var(
         CreateSavedVariableName(env_var));
     if (!saved_env_var)
       continue;
 
     std::string value;
     if (env->GetVar(env_var, &value))
-      env->SetVar(saved_env_var->c_str(), value);
+      env->SetVar(*saved_env_var, value);
     else
-      env->UnSetVar(saved_env_var->c_str());
+      env->UnSetVar(*saved_env_var);
   }
 }
 
 const char* GetDevelSandboxPath() {
   return getenv("CHROME_DEVEL_SANDBOX");
 }
 
 }  // namespace
 
 SetuidSandboxHost* SetuidSandboxHost::Create() {
@@ skipping 83 matching lines @@
   // kZygoteIdFd. Fixing this requires a sandbox API change. :(
   fds_to_remap->push_back(std::make_pair(dummy_fd->get(), kZygoteIdFd));
 }
 
 void SetuidSandboxHost::SetupLaunchEnvironment() {
   SaveSUIDUnsafeEnvironmentVariables(env_.get());
   SetSandboxAPIEnvironmentVariable(env_.get());
 }
 
 }  // namespace sandbox