Revert of Support impl-side painting in Mandoline.

components/html_viewer/discardable_memory_allocator_unittest.cc

 // 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.
 
 #include "components/html_viewer/discardable_memory_allocator.h"
 
 #include "base/memory/discardable_memory.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace html_viewer {
 namespace {
 
 const size_t kOneKilobyte = 1024;
 const size_t kAlmostOneMegabyte = 1023 * kOneKilobyte;
 const size_t kOneMegabyte = 1024 * kOneKilobyte;
 
 TEST(DiscardableMemoryAllocator, Basic) {
-  DiscardableMemoryAllocator allocator(kOneMegabyte);
   scoped_ptr<base::DiscardableMemory> chunk;
-  // Make sure the chunk is locked when allocated. In debug mode, we will
-  // dcheck.
-  chunk = allocator.AllocateLockedDiscardableMemory(kOneKilobyte);
-  chunk->Unlock();
 
-  // Make sure we can lock a chunk.
-  EXPECT_TRUE(chunk->Lock());
-  chunk->Unlock();
+  {
+    DiscardableMemoryAllocator allocator(kOneMegabyte);
+
+    // Make sure the chunk is locked when allocated. In debug mode, we will
+    // dcheck.
+    chunk = allocator.AllocateLockedDiscardableMemory(kOneKilobyte);
+    chunk->Unlock();
+
+    // Make sure we can lock a chunk.
+    EXPECT_TRUE(chunk->Lock());
+    chunk->Unlock();
+  }
+
+  // The chunk's backing should have disappeared with the allocator.
+  EXPECT_FALSE(chunk->Lock());
 }
 
 TEST(DiscardableMemoryAllocator, DiscardChunks) {
   DiscardableMemoryAllocator allocator(kOneMegabyte);
 
   scoped_ptr<base::DiscardableMemory> chunk_to_remove =
       allocator.AllocateLockedDiscardableMemory(kAlmostOneMegabyte);
   chunk_to_remove->Unlock();
 
   // Allocating a second chunk should deallocate the first one due to memory
@@ skipping 22 matching lines @@
   EXPECT_NE(nullptr, chunk_two->data());
   EXPECT_NE(nullptr, chunk_three->data());
 
   chunk_one->Unlock();
   chunk_two->Unlock();
   chunk_three->Unlock();
 }
 
 }  // namespace
 }  // namespace html_viewer