base: Remove OwningMRUCache in favor of scoped_ptrs in MRUCache

ios/chrome/browser/snapshots/lru_cache_unittest.mm

 // 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.
 
 #import "base/mac/scoped_nsobject.h"
 #import "ios/chrome/browser/snapshots/lru_cache.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-@interface LRUCacheTestDelegate : NSObject<LRUCacheDelegate>
-
-@property(nonatomic, retain) id<NSObject> lastEvictedObject;
-@property(nonatomic, assign) NSInteger evictedObjectsCount;
-
-@end
-
-@implementation LRUCacheTestDelegate
-
-@synthesize lastEvictedObject = _lastEvictedObject;
-@synthesize evictedObjectsCount = _evictedObjectsCount;
-
-- (void)lruCacheWillEvictObject:(id<NSObject>)obj {
-  self.lastEvictedObject = obj;
-  ++_evictedObjectsCount;
-}
-
-@end
-
 namespace {
 
 TEST(LRUCacheTest, Basic) {
   base::scoped_nsobject<LRUCache> cache([[LRUCache alloc] initWithCacheSize:3]);
-  base::scoped_nsobject<LRUCacheTestDelegate> delegate(
-      [[LRUCacheTestDelegate alloc] init]);
-  [cache setDelegate:delegate];
 
   base::scoped_nsobject<NSString> value1(
       [[NSString alloc] initWithString:@"Value 1"]);
   base::scoped_nsobject<NSString> value2(
       [[NSString alloc] initWithString:@"Value 2"]);
   base::scoped_nsobject<NSString> value3(
       [[NSString alloc] initWithString:@"Value 3"]);
   base::scoped_nsobject<NSString> value4(
       [[NSString alloc] initWithString:@"Value 4"]);
 
   EXPECT_TRUE([cache count] == 0);
   EXPECT_TRUE([cache isEmpty]);
 
   [cache setObject:value1 forKey:@"VALUE 1"];
   [cache setObject:value2 forKey:@"VALUE 2"];
   [cache setObject:value3 forKey:@"VALUE 3"];
   [cache setObject:value4 forKey:@"VALUE 4"];
 
   EXPECT_TRUE([cache count] == 3);
-  EXPECT_TRUE([delegate evictedObjectsCount] == 1);
-  EXPECT_TRUE([delegate lastEvictedObject] == value1.get());
 
   // Check LRU behaviour, the value least recently added value should have been
   // evicted.
   id value = [cache objectForKey:@"VALUE 1"];
   EXPECT_TRUE(value == nil);
 
   value = [cache objectForKey:@"VALUE 2"];
   EXPECT_TRUE(value == value2.get());
 
   // Removing a non existing key shouldn't do anything.
   [cache removeObjectForKey:@"XXX"];
   EXPECT_TRUE([cache count] == 3);
 
   [cache removeAllObjects];
   EXPECT_TRUE([cache isEmpty]);
 }
 
 }  // namespace