Move Sky's DataPipeDrainer to mojo/common

mojo/common/data_pipe_drainer.h

Index: mojo/common/data_pipe_drainer.h
diff --git a/sky/engine/platform/fetcher/DataPipeDrainer.h b/mojo/common/data_pipe_drainer.h
similarity index 81%
rename from sky/engine/platform/fetcher/DataPipeDrainer.h
rename to mojo/common/data_pipe_drainer.h
index 2f6ce6495d453823127e9320fce2fc5995d4ec91..c9669be7a8564ff0de6f39dc4bb21ebbd4f47489 100644
--- a/sky/engine/platform/fetcher/DataPipeDrainer.h
+++ b/mojo/common/data_pipe_drainer.h
@@ -2,14 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef SKY_ENGINE_PLATFORM_FETCHER_DATAPIPEDRAINER_H_
-#define SKY_ENGINE_PLATFORM_FETCHER_DATAPIPEDRAINER_H_
+#ifndef MOJO_COMMON_DATA_PIPE_DRAINER_H_
+#define MOJO_COMMON_DATA_PIPE_DRAINER_H_
 
 #include "base/memory/weak_ptr.h"
 #include "mojo/common/handle_watcher.h"
 #include "mojo/public/cpp/system/core.h"
 
-namespace blink {
+namespace mojo {
+namespace common {
 
 class DataPipeDrainer {
  public:
@@ -39,6 +40,7 @@ class DataPipeDrainer {
   DISALLOW_COPY_AND_ASSIGN(DataPipeDrainer);
 };
 
-}  // namespace blink
+}  // namespace common
+}  // namespace mojo
 
-#endif  // SKY_ENGINE_PLATFORM_FETCHER_DATAPIPEDRAINER_H_
+#endif  // MOJO_COMMON_DATA_PIPE_DRAINER_H_