Fixed PolicyLoaderIOS unit tests on iOS 6.1.

These tests and the feature that they test rely on iOS 7 APIs.
This change skips those tests if the platform is not recent enough.

BUG=348820

Review URL: https://codereview.chromium.org/213703005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@260460 0039d316-1c4b-4281-b951-d872f2087c98

components/policy/core/common/policy_loader_ios_unittest.mm

@@ -7,6 +7,7 @@
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/files/file_path.h"
+#include "base/ios/ios_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/test/test_simple_task_runner.h"
 #include "base/values.h"
@@ -144,7 +145,13 @@ PolicyProviderTestHarness* TestHarness::Create() {
 
 // static
 PolicyProviderTestHarness* TestHarness::CreateWithEncodedKey() {
-  return new TestHarness(true);
+  if (base::ios::IsRunningOnIOS7OrLater())
+    return new TestHarness(true);
+  // Earlier versions of iOS don't have the APIs to support this test.
+  // Unfortunately it's not possible to conditionally run this harness using
+  // gtest, so we just fallback to running the non-encoded version.
+  NSLog(@"Skipping test");
+  return new TestHarness(false);
 }
 
 void TestHarness::AddPolicies(NSDictionary* policy) {
@@ -224,6 +231,12 @@ TEST(PolicyProviderIOSTest, ChromePolicyOverEncodedChromePolicy) {
   // This test verifies that if the "ChromePolicy" key is present then the
   // "EncodedChromePolicy" key is ignored.
 
+  if (!base::ios::IsRunningOnIOS7OrLater()) {
+    // Skip this test if running on a version earlier than iOS 7.
+    NSLog(@"Skipping test");
+    return;
+  }
+
   NSDictionary* policy = @{
     @"shared": @"wrong",
     @"key1": @"value1",