base: Convert scoped_arrays to the new scoped_ptr style.

base/file_util_proxy.cc

Index: base/file_util_proxy.cc
diff --git a/base/file_util_proxy.cc b/base/file_util_proxy.cc
index 290279ef3e20823760e72ed3fefb5abc5a8b7246..c116186735c04d2ef2efec0c425fa4d3c19911d6 100644
--- a/base/file_util_proxy.cc
+++ b/base/file_util_proxy.cc
@@ -152,7 +152,7 @@ class ReadHelper {
   }
 
  private:
-  scoped_array<char> buffer_;
+  scoped_ptr<char[]> buffer_;
   int bytes_to_read_;
   int bytes_read_;
   DISALLOW_COPY_AND_ASSIGN(ReadHelper);
@@ -181,7 +181,7 @@ class WriteHelper {
   }
 
  private:
-  scoped_array<char> buffer_;
+  scoped_ptr<char[]> buffer_;
   int bytes_to_write_;
   int bytes_written_;
   DISALLOW_COPY_AND_ASSIGN(WriteHelper);