Use base::PostTaskAndReplyWithResults() in more places.

components/nacl/browser/nacl_browser.cc

Index: components/nacl/browser/nacl_browser.cc
diff --git a/components/nacl/browser/nacl_browser.cc b/components/nacl/browser/nacl_browser.cc
index 04bc7a27675186aefdd83139109874428d005a57..b1f1236b7a29e5cc897198c77f237243b38ed283 100644
--- a/components/nacl/browser/nacl_browser.cc
+++ b/components/nacl/browser/nacl_browser.cc
@@ -119,34 +119,32 @@ const int64 kCrashesIntervalInSeconds = 120;
 
 namespace nacl {
 
-void OpenNaClExecutableImpl(const base::FilePath& file_path,
-                            base::PlatformFile* file) {
+base::PlatformFile OpenNaClExecutableImpl(const base::FilePath& file_path) {
   // Get a file descriptor. On Windows, we need 'GENERIC_EXECUTE' in order to
   // memory map the executable.
   // IMPORTANT: This file descriptor must not have write access - that could
   // allow a NaCl inner sandbox escape.
+  base::PlatformFile file;
   base::PlatformFileError error_code;
-  *file = base::CreatePlatformFile(
+  file = base::CreatePlatformFile(
       file_path,
       (base::PLATFORM_FILE_OPEN |
        base::PLATFORM_FILE_READ |
        base::PLATFORM_FILE_EXECUTE),  // Windows only flag.
       NULL,
       &error_code);
-  if (error_code != base::PLATFORM_FILE_OK) {
-    *file = base::kInvalidPlatformFileValue;
-    return;
-  }
+  if (error_code != base::PLATFORM_FILE_OK)
+    return base::kInvalidPlatformFileValue;
+
   // Check that the file does not reference a directory. Returning a descriptor
   // to an extension directory could allow an outer sandbox escape. openat(...)
   // could be used to traverse into the file system.
   base::PlatformFileInfo file_info;
-  if (!base::GetPlatformFileInfo(*file, &file_info) ||
-      file_info.is_directory) {
-    base::ClosePlatformFile(*file);
-    *file = base::kInvalidPlatformFileValue;
-    return;
+  if (!base::GetPlatformFileInfo(file, &file_info) || file_info.is_directory) {
+    base::ClosePlatformFile(file);
+    return base::kInvalidPlatformFileValue;
   }
+  return file;
 }
 
 NaClBrowser::NaClBrowser()