[tracing] directly use memory-infra from blink -> base

third_party/WebKit/Source/platform/exported/Platform.cpp

Index: third_party/WebKit/Source/platform/exported/Platform.cpp
diff --git a/third_party/WebKit/Source/platform/exported/Platform.cpp b/third_party/WebKit/Source/platform/exported/Platform.cpp
index 2b2ccb844556789f76c7a95a312bf5460fffa513..13b7c4b83dd8dbc1a75a17881977056202fa57c3 100644
--- a/third_party/WebKit/Source/platform/exported/Platform.cpp
+++ b/third_party/WebKit/Source/platform/exported/Platform.cpp
@@ -29,6 +29,7 @@
  */
 
 #include "config.h"
+#include "base/trace_event/memory_dump_manager.h"
 #include "platform/PartitionAllocMemoryDumpProvider.h"
 #include "public/platform/Platform.h"
 
@@ -49,13 +50,13 @@ void Platform::initialize(Platform* platform)
 
     // TODO(ssid): remove this check after fixing crbug.com/486782.
     if (s_platform && s_platform->m_mainThread)
-        s_platform->registerMemoryDumpProvider(PartitionAllocMemoryDumpProvider::instance());
+        base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(PartitionAllocMemoryDumpProvider::instance());
 }
 
 void Platform::shutdown()
 {
     if (s_platform->m_mainThread)
-        s_platform->unregisterMemoryDumpProvider(PartitionAllocMemoryDumpProvider::instance());
+        base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(PartitionAllocMemoryDumpProvider::instance());
 
     if (s_platform)
         s_platform->m_mainThread = 0;