Remove unused parts of //mojo/common.

mojo/common/data_pipe_utils.h

Index: mojo/common/data_pipe_utils.h
diff --git a/mojo/common/data_pipe_utils.h b/mojo/common/data_pipe_utils.h
index 426912c95b46cb7996dac46fa784ee8aafe330b7..a3f7c093e47550e2f0bbdcbc0237e69ded523def 100644
--- a/mojo/common/data_pipe_utils.h
+++ b/mojo/common/data_pipe_utils.h
@@ -2,41 +2,19 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef MOJO_SHELL_DATA_PIPE_UTILS_H_
-#define MOJO_SHELL_DATA_PIPE_UTILS_H_
+#ifndef MOJO_COMMON_DATA_PIPE_UTILS_H_
+#define MOJO_COMMON_DATA_PIPE_UTILS_H_
 
 #include <stdint.h>
 
 #include <string>
 
-#include "base/callback_forward.h"
 #include "mojo/common/mojo_common_export.h"
-#include "mojo/public/cpp/system/core.h"
-
-namespace base {
-class FilePath;
-class TaskRunner;
-}
+#include "mojo/public/cpp/system/data_pipe.h"
 
 namespace mojo {
 namespace common {
 
-// Asynchronously copies data from source to the destination file. The given
-// |callback| is run upon completion. File writes will be scheduled to the
-// given |task_runner|.
-void MOJO_COMMON_EXPORT CopyToFile(
-    ScopedDataPipeConsumerHandle source,
-    const base::FilePath& destination,
-    base::TaskRunner* task_runner,
-    const base::Callback<void(bool /*success*/)>& callback);
-
-void MOJO_COMMON_EXPORT
-CopyFromFile(const base::FilePath& source,
-             ScopedDataPipeProducerHandle destination,
-             uint32_t skip,
-             base::TaskRunner* task_runner,
-             const base::Callback<void(bool /*success*/)>& callback);
-
 // Copies the data from |source| into |contents| and returns true on success and
 // false on error.  In case of I/O error, |contents| holds the data that could
 // be read from source before the error occurred.
@@ -48,13 +26,7 @@ bool MOJO_COMMON_EXPORT BlockingCopyFromString(
     const std::string& source,
     const ScopedDataPipeProducerHandle& destination);
 
-// Synchronously copies data from source to the destination file returning true
-// on success and false on error.  In case of an error, |destination| holds the
-// data that could be read from the source before the error occured.
-bool MOJO_COMMON_EXPORT BlockingCopyToFile(ScopedDataPipeConsumerHandle source,
-                                           const base::FilePath& destination);
-
 }  // namespace common
 }  // namespace mojo
 
-#endif  // MOJO_SHELL_DATA_PIPE_UTILS_H_
+#endif  // MOJO_COMMON_DATA_PIPE_UTILS_H_