Removed use of IsRunningOnIOS8OrLater from snapshots code.

ios/chrome/browser/snapshots/snapshot_cache_unittest.mm

 // Copyright 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.
 
 #import "ios/chrome/browser/snapshots/snapshot_cache.h"
 
 #import <Foundation/Foundation.h>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 331 matching lines @@
     if (i == 0)
       EXPECT_TRUE(base::PathExists(path));
     else
       EXPECT_FALSE(base::PathExists(path));
   }
 }
 
 // Loads the color images into the cache, and pins two of them.  Ensures that
 // only the two pinned IDs remain in memory after a call to -handleLowMemory.
 TEST_F(SnapshotCacheTest, HandleLowMemory) {
-// TODO(droger): This test fails on iPad iOS8 device: http://crbug.com/455209
+// TODO(crbug.com/455209): This test failed on iPad iOS8 device, but may no
+// longer be failing on iOS 9 and up. Should test by re-enabling and monitor.
 #if !TARGET_IPHONE_SIMULATOR
-  if (IsIPadIdiom() && base::ios::IsRunningOnIOS8OrLater()) {
-    LOG(WARNING) << "Test disabled on iPad iOS8 device.";
+  if (IsIPadIdiom()) {
+    LOG(WARNING) << "Test disabled on iPad device.";
     return;
   }
 #endif
 
   LoadAllColorImagesIntoCache(true);
 
   SnapshotCache* cache = GetSnapshotCache();
 
   NSString* firstPinnedID = [testSessions_ objectAtIndex:4];
   NSString* secondPinnedID = [testSessions_ objectAtIndex:6];
@@ skipping 216 matching lines @@
   EXPECT_TRUE(base::PathExists(retinaFile));
 
   // Delete the image.
   [cache removeImageWithSessionID:kSession];
   FlushRunLoops();  // ensure the file is removed.
 
   EXPECT_FALSE(base::PathExists(retinaFile));
 }
 
 }  // namespace