Replace blink::WebDiscardableMemory with base::DiscardableMemory.

third_party/WebKit/Source/platform/testing/RunAllTests.cpp

Index: third_party/WebKit/Source/platform/testing/RunAllTests.cpp
diff --git a/third_party/WebKit/Source/platform/testing/RunAllTests.cpp b/third_party/WebKit/Source/platform/testing/RunAllTests.cpp
index 15791e547834e88d1d8e6b46e4d4c178461f709c..a632580b366aae65e2e6e437321baf145ac810f4 100644
--- a/third_party/WebKit/Source/platform/testing/RunAllTests.cpp
+++ b/third_party/WebKit/Source/platform/testing/RunAllTests.cpp
@@ -28,6 +28,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include "base/memory/discardable_memory_allocator.h"
+#include "base/test/test_discardable_memory_allocator.h"
 #include "base/test/test_io_thread.h"
 #include "mojo/edk/embedder/embedder.h"
 #include "mojo/edk/test/scoped_ipc_support.h"
@@ -74,6 +76,9 @@ int main(int argc, char** argv)
 {
     base::CommandLine::Init(argc, argv);
 
+    base::TestDiscardableMemoryAllocator discardableMemoryAllocator;
+    base::DiscardableMemoryAllocator::SetInstance(&discardableMemoryAllocator);
+
     OwnPtr<DummyPlatform> platform = adoptPtr(new DummyPlatform);
     blink::Platform::setCurrentPlatformForTesting(platform.get());