Revert of Refactoring: Move some classes from content/child to platform

third_party/WebKit/public/platform/WebProcessMemoryDump.h

 // Copyright 2015 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.
 
 #ifndef WebProcessMemoryDump_h
 #define WebProcessMemoryDump_h
 
 #include "WebCommon.h"
 #include "WebMemoryAllocatorDump.h"
 #include "WebMemoryDumpProvider.h"
 #include "WebString.h"
 #include "base/trace_event/heap_profiler_allocation_context.h"
 
 class SkTraceMemoryDump;
 
 namespace base {
-
-class DiscardableMemory;
-
 namespace trace_event {
 
 class ProcessMemoryDump;
 class TraceEventMemoryOverhead;
 
 } // namespace trace_event
 } // namespace base
 
 namespace blink {
 
@@ skipping 80 matching lines @@
     // by WebProcessMemoryDump and cannot outlive the WebProcessMemoryDump
     // object owning them. |dumpNamePrefix| is prefix appended to each dump
     // created by the SkTraceMemoryDump implementation, if the dump should be
     // placed under different namespace and not "skia".
     virtual SkTraceMemoryDump* createDumpAdapterForSkia(const WebString& dumpNamePrefix)
     {
         BLINK_ASSERT_NOT_REACHED();
         return nullptr;
     }
 
-    virtual blink::WebMemoryAllocatorDump* createDiscardableMemoryAllocatorDump(const std::string& name, base::DiscardableMemory* discardable)
-    {
-        BLINK_ASSERT_NOT_REACHED();
-        return nullptr;
-    }
-
     // Dumps heap memory usage. |allocatorName| is used as an absolute name for
     // base::trace_event::ProcessMemoryDump::AddHeapDump.
     virtual void dumpHeapUsage(const base::hash_map<base::trace_event::AllocationContext, size_t>& bytesByContext, base::trace_event::TraceEventMemoryOverhead& overhead, const char* allocatorName)
     {
         BLINK_ASSERT_NOT_REACHED();
     }
 };
 
 } // namespace blink
 
 #endif // WebProcessMemoryDump_h