Revert of Support impl-side painting in Mandoline.

components/html_viewer/discardable_memory_allocator_unittest.cc

Index: components/html_viewer/discardable_memory_allocator_unittest.cc
diff --git a/components/html_viewer/discardable_memory_allocator_unittest.cc b/components/html_viewer/discardable_memory_allocator_unittest.cc
index 95cea2950bafdd45c08303f83e6da6c295f46487..cc73fb0cbbfb115d8cde3b543767967ffd9a24c5 100644
--- a/components/html_viewer/discardable_memory_allocator_unittest.cc
+++ b/components/html_viewer/discardable_memory_allocator_unittest.cc
@@ -15,16 +15,23 @@
 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) {