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Before this change, tests of raw output of the rewriter (i.e. tests run
without passing --apply-edits to tools/clang/scripts/test_tool.py) might
need to encode the full, absolute path in the test expectations.  This
meant that the tests wouldn't work on another developer's machine (where
Chromium repo might be in a different location).

After this change:
- tools/clang/rewrite_raw_ptr_fields/tests/gen-*-expected.txt
  expectation files use paths delative to the
  rewrite_raw_ptr_fields/tests/ directory (rather than hardcoding a
  value of
  .../lukasza/src/chromium4/src/tools/clang/rewrite_raw_ptr_fields/tests
- tools/clang/scripts/test_tool.py normalizes paths in the raw output
  (only if invoked without --apply-edits) to make the paths relative to
  the tests directory

Bug: 1069567
Change-Id: I03c54374bb861904e439e677a271b0dec1502b67
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2282888
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786330}