Mac: Avoid deprecated use of ::Gestalt() in base/sys_info_mac

base/sys_info_mac.mm

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright 2016 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 "base/sys_info.h"
 
 #include <ApplicationServices/ApplicationServices.h>
 #include <CoreServices/CoreServices.h>
+#import <Foundation/Foundation.h>
 #include <mach/mach_host.h>
 #include <mach/mach_init.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <sys/sysctl.h>
 #include <sys/types.h>
 
 #include "base/logging.h"
+#include "base/mac/mac_util.h"
 #include "base/mac/scoped_mach_port.h"
+#import "base/mac/sdk_forward_declarations.h"
 #include "base/macros.h"
 #include "base/strings/stringprintf.h"
 
 namespace base {
 
 // static
 std::string SysInfo::OperatingSystemName() {
   return "Mac OS X";
 }
 
 // static
 std::string SysInfo::OperatingSystemVersion() {
   int32_t major, minor, bugfix;
   OperatingSystemVersionNumbers(&major, &minor, &bugfix);
   return base::StringPrintf("%d.%d.%d", major, minor, bugfix);
 }
 
 // static
 void SysInfo::OperatingSystemVersionNumbers(int32_t* major_version,
                                             int32_t* minor_version,
                                             int32_t* bugfix_version) {
-  Gestalt(gestaltSystemVersionMajor,
-      reinterpret_cast<SInt32*>(major_version));
-  Gestalt(gestaltSystemVersionMinor,
-      reinterpret_cast<SInt32*>(minor_version));
-  Gestalt(gestaltSystemVersionBugFix,
-      reinterpret_cast<SInt32*>(bugfix_version));
+  NSProcessInfo* processInfo = [NSProcessInfo processInfo];
+  if ([processInfo respondsToSelector:@selector(operatingSystemVersion)]) {
+    NSOperatingSystemVersion version = [processInfo operatingSystemVersion];
+    *major_version = version.majorVersion;
+    *minor_version = version.minorVersion;
+    *bugfix_version = version.patchVersion;
+  } else {
+    // -[NSProcessInfo operatingSystemVersion] is documented available in 10.10.
+    // It's also available via a private API since 10.9.2. For the remaining
+    // cases in 10.9, rely on ::Gestalt(..). Since this code is only needed for
+    // 10.9.0 and 10.9.1 and uses the recommended replacement thereafter,
+    // suppress the warning for this fallback case.
+    DCHECK(base::mac::IsOSMavericks());
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+    Gestalt(gestaltSystemVersionMajor,
+            reinterpret_cast<SInt32*>(major_version));
+    Gestalt(gestaltSystemVersionMinor,
+            reinterpret_cast<SInt32*>(minor_version));
+    Gestalt(gestaltSystemVersionBugFix,
+            reinterpret_cast<SInt32*>(bugfix_version));
+#pragma clang diagnostic pop
+  }
 }
 
 // static
 int64_t SysInfo::AmountOfPhysicalMemory() {
   struct host_basic_info hostinfo;
   mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
   base::mac::ScopedMachSendRight host(mach_host_self());
   int result = host_info(host.get(),
                          HOST_BASIC_INFO,
                          reinterpret_cast<host_info_t>(&hostinfo),
@@ skipping 35 matching lines @@
 
 std::string SysInfo::HardwareModelName() {
   char model[256];
   size_t len = sizeof(model);
   if (sysctlbyname("hw.model", model, &len, NULL, 0) == 0)
     return std::string(model, 0, len);
   return std::string();
 }
 
 }  // namespace base