Add our own (mojo::util::)ScopedFILE and replace uses of base::ScopedFILE with it.

mojo/edk/test/test_utils.h

Index: mojo/edk/test/test_utils.h
diff --git a/mojo/edk/test/test_utils.h b/mojo/edk/test/test_utils.h
index 9c21a1a29ed109be9ecb90b4e5aa62bb7d277ac6..fad57ba4c7524aa26d40a1e04fb2636f0744e88f 100644
--- a/mojo/edk/test/test_utils.h
+++ b/mojo/edk/test/test_utils.h
@@ -10,9 +10,9 @@
 
 #include <string>
 
-#include "base/files/scoped_file.h"
 #include "mojo/edk/embedder/platform_handle.h"
 #include "mojo/edk/embedder/scoped_platform_handle.h"
+#include "mojo/edk/util/scoped_file.h"
 
 namespace mojo {
 namespace test {
@@ -41,10 +41,10 @@ bool NonBlockingRead(const embedder::PlatformHandle& handle,
                      size_t* bytes_read);
 
 // Gets a (scoped) |PlatformHandle| from the given (scoped) |FILE|.
-embedder::ScopedPlatformHandle PlatformHandleFromFILE(base::ScopedFILE fp);
+embedder::ScopedPlatformHandle PlatformHandleFromFILE(util::ScopedFILE fp);
 
 // Gets a (scoped) |FILE| from a (scoped) |PlatformHandle|.
-base::ScopedFILE FILEFromPlatformHandle(embedder::ScopedPlatformHandle h,
+util::ScopedFILE FILEFromPlatformHandle(embedder::ScopedPlatformHandle h,
                                         const char* mode);
 
 }  // namespace test