base: Remove OwningMRUCache in favor of scoped_ptrs in MRUCache

ios/chrome/browser/snapshots/lru_cache_unittest.mm

Index: ios/chrome/browser/snapshots/lru_cache_unittest.mm
diff --git a/ios/chrome/browser/snapshots/lru_cache_unittest.mm b/ios/chrome/browser/snapshots/lru_cache_unittest.mm
index 858a5c38bfab70da2af822e468b941eb2e0f6136..ef0b920ad87b019d455f8190f4e55af5cfcb521e 100644
--- a/ios/chrome/browser/snapshots/lru_cache_unittest.mm
+++ b/ios/chrome/browser/snapshots/lru_cache_unittest.mm
@@ -6,32 +6,10 @@
 #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"]);
@@ -51,8 +29,6 @@ TEST(LRUCacheTest, Basic) {
   [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.