Revert "base: Implement browser process support for discardable memory."

ui/message_center/test/run_all_unittests.cc

 // Copyright 2014 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 "base/basictypes.h"
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/path_service.h"
 #include "base/test/launcher/unit_test_launcher.h"
-#include "base/test/test_discardable_memory_shmem_allocator.h"
 #include "base/test/test_suite.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/ui_base_paths.h"
 
 #if defined(OS_MACOSX)
 #include "base/test/mock_chrome_application_mac.h"
 #else
 #include "ui/gl/gl_surface.h"
 #endif
@@ skipping 10 matching lines @@
     mock_cr_app::RegisterMockCrApp();
 #else
     gfx::GLSurface::InitializeOneOffForTests();
 #endif
     base::TestSuite::Initialize();
     ui::RegisterPathProvider();
 
     base::FilePath ui_test_pak_path;
     ASSERT_TRUE(PathService::Get(ui::UI_TEST_PAK, &ui_test_pak_path));
     ui::ResourceBundle::InitSharedInstanceWithPakPath(ui_test_pak_path);
-
-    base::DiscardableMemoryShmemAllocator::SetInstance(
-        &discardable_memory_allocator_);
   }
 
   void Shutdown() override {
     ui::ResourceBundle::CleanupSharedInstance();
     base::TestSuite::Shutdown();
   }
 
  private:
-  base::TestDiscardableMemoryShmemAllocator discardable_memory_allocator_;
-
   DISALLOW_COPY_AND_ASSIGN(MessageCenterTestSuite);
 };
 
 }  // namespace
 
 int main(int argc, char** argv) {
   MessageCenterTestSuite test_suite(argc, argv);
 
   return base::LaunchUnitTests(
       argc,
       argv,
       base::Bind(&MessageCenterTestSuite::Run, base::Unretained(&test_suite)));
 }