Revert "find_headers.py to better find headers."

This reverts commit 6c8ad116d460fe892fff77b8f80e284e3487d59d.

Reason for revert:

https://chromium-swarm.appspot.com/task?id=3db0ac33aa369910&refresh=10

[981/1474] ACTION //:skia.h(//gn/toolchain:gcc_like)
FAILED: gen/skia.h 
python ../../../gn/find_headers.py /mnt/pd0/s/w/ir/cache/work/skia/bin/gn /mnt/pd0/s/w/ir/cache/work/skia/ gen/skia.h /mnt/pd0/s/w/ir/cache/work/skia/include/android /mnt/pd0/s/w/ir/cache/work/skia/include/c /mnt/pd0/s/w/ir/cache/work/skia/include/codec /mnt/pd0/s/w/ir/cache/work/skia/include/config /mnt/pd0/s/w/ir/cache/work/skia/include/core /mnt/pd0/s/w/ir/cache/work/skia/include/effects /mnt/pd0/s/w/ir/cache/work/skia/include/encode /mnt/pd0/s/w/ir/cache/work/skia/include/gpu /mnt/pd0/s/w/ir/cache/work/skia/include/atlastext /mnt/pd0/s/w/ir/cache/work/skia/include/pathops /mnt/pd0/s/w/ir/cache/work/skia/include/ports /mnt/pd0/s/w/ir/cache/work/skia/include/svg /mnt/pd0/s/w/ir/cache/work/skia/include/utils /mnt/pd0/s/w/ir/cache/work/skia/include/utils/mac /mnt/pd0/s/w/ir/cache/work/skia/include/atlastext
Traceback (most recent call last):
  File "../../../gn/find_headers.py", line 32, in <module>
    sources_json = json.loads(subprocess.check_output(gn_sources_cmd))
  File "/usr/lib/python2.7/json/__init__.py", line 339, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python2.7/json/decoder.py", line 364, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python2.7/json/decoder.py", line 382, in raw_decode
    raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded

Original change's description:
> find_headers.py to better find headers.
> 
> The find_headers.py script claims to "recursively search each include
> directory for headers" but the recursive part has been left out.
> 
> This changes find_headers to instead find all the sources which are in
> public include directories and list them with the shortest possible
> path. This removes the need for a blacklist and also handles includes in
> subdirectories of public include directories.
> 
> Change-Id: Ib59256a2059d37d4459686c421923207ac7acf38
> Reviewed-on: https://skia-review.googlesource.com/129660
> Reviewed-by: Greg Daniel <egdaniel@google.com>
> Commit-Queue: Ben Wagner <bungeman@google.com>

TBR=egdaniel@google.com,mtklein@google.com,bungeman@google.com

Change-Id: I5cca85754f1b9fde7771ab0ed1bd8117ee96a970
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/130181
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>

1 files changed, 1 insertions, 3 deletions

diff --git a/BUILD.gn b/BUILD.gn
index dd509c26d9..1f515667e5 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1014,9 +1014,7 @@ if (skia_enable_tools) {
     public_configs = [ ":skia.h_config" ]
     skia_h = "$target_gen_dir/skia.h"
     script = "gn/find_headers.py"
-    args = [ rebase_path("//bin/gn") ] +
-           [ rebase_path("//") ] +
-           [ rebase_path(skia_h, root_build_dir) ] +
+    args = [ rebase_path(skia_h, root_build_dir) ] +
            rebase_path(skia_public_includes)
     depfile = "$skia_h.deps"
     outputs = [