Revert of V2 of //tools/binary_size rewrite (diffs).

tools/binary_size/testdata/ActualDiff.golden

Index: tools/binary_size/testdata/ActualDiff.golden
diff --git a/tools/binary_size/testdata/ActualDiff.golden b/tools/binary_size/testdata/ActualDiff.golden
deleted file mode 100644
index e05d1800ac4acc967969b1da80874739763abc6b..0000000000000000000000000000000000000000
--- a/tools/binary_size/testdata/ActualDiff.golden
+++ /dev/null
@@ -1,17 +0,0 @@
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-+        0 b@0x0         262144  third_party/ffmpeg/libffmpeg_internal.a/fft_float.o
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