Replace blink::WebDiscardableMemory with base::DiscardableMemory.

third_party/WebKit/Source/platform/SharedBufferTest.cpp

Index: third_party/WebKit/Source/platform/SharedBufferTest.cpp
diff --git a/third_party/WebKit/Source/platform/SharedBufferTest.cpp b/third_party/WebKit/Source/platform/SharedBufferTest.cpp
index 2178dddf7d3f2efd508bf6f144c576b66b7187b5..5dfda03d95418fbc32ee110b021e0ccbad8a0547 100644
--- a/third_party/WebKit/Source/platform/SharedBufferTest.cpp
+++ b/third_party/WebKit/Source/platform/SharedBufferTest.cpp
@@ -30,9 +30,9 @@
 
 #include "platform/SharedBuffer.h"
 
-#include "platform/testing/TestingPlatformSupport.h"
-#include "public/platform/WebDiscardableMemory.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "wtf/OwnPtr.h"
+#include "wtf/PassOwnPtr.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 #include <algorithm>
@@ -133,10 +133,6 @@ TEST(SharedBufferTest, createPurgeable)
     Vector<char> testData(30000);
     std::generate(testData.begin(), testData.end(), &std::rand);
 
-    TestingPlatformSupport::Config config;
-    config.hasDiscardableMemorySupport = true;
-    TestingPlatformSupport platformWithDiscardableMemorySupport(config);
-
     size_t length = testData.size();
     RefPtr<SharedBuffer> sharedBuffer = SharedBuffer::createPurgeable(testData.data(), length);
     ASSERT_EQ(length, sharedBuffer->size());