Revert of base: Introduce an explicit call for reducing emulated discardable memory usage.

content/renderer/render_thread_impl_browsertest.cc

Index: content/renderer/render_thread_impl_browsertest.cc
diff --git a/content/renderer/render_thread_impl_browsertest.cc b/content/renderer/render_thread_impl_browsertest.cc
index 55a4379c25505ca4ef451fe3c424a0b12ca76b59..f5a0d1d7f7df750f26ae6beba93868d40690dcfd 100644
--- a/content/renderer/render_thread_impl_browsertest.cc
+++ b/content/renderer/render_thread_impl_browsertest.cc
@@ -3,8 +3,6 @@
 // found in the LICENSE file.
 
 #include "base/command_line.h"
-#include "base/memory/discardable_memory.h"
-#include "base/memory/scoped_vector.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_switches.h"
@@ -72,55 +70,5 @@
       base::Bind(&CheckRenderThreadInputHandlerManager, thread));
 }
 
-// Checks that emulated discardable memory is discarded when the last widget
-// is hidden.
-TEST_F(RenderThreadImplBrowserTest,
-       EmulatedDiscardableMemoryDiscardedWhenWidgetsHidden) {
-  ContentClient content_client;
-  ContentBrowserClient content_browser_client;
-  ContentRendererClient content_renderer_client;
-  SetContentClient(&content_client);
-  SetBrowserClientForTesting(&content_browser_client);
-  SetRendererClientForTesting(&content_renderer_client);
-  base::MessageLoopForIO message_loop_;
-
-  std::string channel_id =
-      IPC::Channel::GenerateVerifiedChannelID(std::string());
-  DummyListener dummy_listener;
-  scoped_ptr<IPC::Channel> channel(
-      IPC::Channel::CreateServer(channel_id, &dummy_listener));
-  ASSERT_TRUE(channel->Connect());
-
-  scoped_ptr<MockRenderProcess> mock_process(new MockRenderProcess);
-  // Owned by mock_process.
-  RenderThreadImpl* thread = new RenderThreadImpl(channel_id);
-  thread->EnsureWebKitInitialized();
-  thread->WidgetCreated();
-
-  // Allocate 128MB of discardable memory.
-  ScopedVector<base::DiscardableMemory> discardable_memory;
-  for (int i = 0; i < 32; ++i) {
-    discardable_memory.push_back(
-        base::DiscardableMemory::CreateLockedMemoryWithType(
-            base::DISCARDABLE_MEMORY_TYPE_EMULATED, 4 * 1024 * 1024).release());
-    ASSERT_TRUE(discardable_memory.back());
-    discardable_memory.back()->Unlock();
-  }
-
-  // Hide all widgets.
-  thread->WidgetHidden();
-
-  // Count how much memory is left, should be at most one block.
-  int blocks_left = 0;
-  for (auto iter = discardable_memory.begin(); iter != discardable_memory.end();
-       ++iter) {
-    if ((*iter)->Lock() == base::DISCARDABLE_MEMORY_LOCK_STATUS_SUCCESS)
-      ++blocks_left;
-  }
-  EXPECT_LE(blocks_left, 1);
-
-  thread->WidgetDestroyed();
-}
-
 }  // namespace
 }  // namespace content