[COIL] Change chromium code search type links to use main rather than master for docs

    See this doc: go/chromium-coil-change for more info
    BUG=1210385

Change-Id: I6cd8548301e360bae8e71384dbd8ef11aa6c985f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2902904
Reviewed-by: My Nguyen <[email protected]>
Commit-Queue: My Nguyen <[email protected]>
Auto-Submit: John Palmer <[email protected]>
Cr-Commit-Position: refs/heads/master@{#885851}
diff --git a/docs/gpu/gpu_testing.md b/docs/gpu/gpu_testing.md
index 7b73a60..67e4ce65f 100644
--- a/docs/gpu/gpu_testing.md
+++ b/docs/gpu/gpu_testing.md
@@ -43,9 +43,9 @@
 failures on the tryservers. For more details about the configuration of the
 bots, see the [GPU bot details].
 
-[recipe framework]: https://chromium.googlesource.com/external/github.com/luci/recipes-py/+/master/doc/user_guide.md
-[recipes/chromium]:        https://chromium.googlesource.com/chromium/tools/build/+/master/scripts/slave/recipes/chromium.py
-[recipes/chromium_trybot]: https://chromium.googlesource.com/chromium/tools/build/+/master/scripts/slave/recipes/chromium_trybot.py
+[recipe framework]: https://chromium.googlesource.com/external/github.com/luci/recipes-py/+/main/doc/user_guide.md
+[recipes/chromium]:        https://chromium.googlesource.com/chromium/tools/build/+/main/scripts/slave/recipes/chromium.py
+[recipes/chromium_trybot]: https://chromium.googlesource.com/chromium/tools/build/+/main/scripts/slave/recipes/chromium_trybot.py
 [GPU bot details]: gpu_testing_bot_details.md
 
 The physical hardware for the GPU bots lives in the Swarming pool\*. The
@@ -159,7 +159,7 @@
 Chromium (`src/`) and ANGLE (`src/third_party/angle/`), please
 [file a bug](http://crbug.com/new) with component Internals\>GPU\>Testing.
 
-[ANGLE project]: https://chromium.googlesource.com/angle/angle/+/master/README.md
+[ANGLE project]: https://chromium.googlesource.com/angle/angle/+/main/README.md
 [tryserver.chromium.angle]: https://build.chromium.org/p/tryserver.chromium.angle/waterfall
 [file a bug]: http://crbug.com/new
 
@@ -505,15 +505,15 @@
 The tests that are run by the GPU bots are described by a couple of JSON files
 in the Chromium workspace:
 
-*   [`chromium.gpu.json`](https://chromium.googlesource.com/chromium/src/+/master/testing/buildbot/chromium.gpu.json)
-*   [`chromium.gpu.fyi.json`](https://chromium.googlesource.com/chromium/src/+/master/testing/buildbot/chromium.gpu.fyi.json)
+*   [`chromium.gpu.json`](https://chromium.googlesource.com/chromium/src/+/main/testing/buildbot/chromium.gpu.json)
+*   [`chromium.gpu.fyi.json`](https://chromium.googlesource.com/chromium/src/+/main/testing/buildbot/chromium.gpu.fyi.json)
 
 These files are autogenerated by the following script:
 
-*   [`generate_buildbot_json.py`](https://chromium.googlesource.com/chromium/src/+/master/testing/buildbot/generate_buildbot_json.py)
+*   [`generate_buildbot_json.py`](https://chromium.googlesource.com/chromium/src/+/main/testing/buildbot/generate_buildbot_json.py)
 
 This script is documented in
-[`testing/buildbot/README.md`](https://chromium.googlesource.com/chromium/src/+/master/testing/buildbot/README.md). The
+[`testing/buildbot/README.md`](https://chromium.googlesource.com/chromium/src/+/main/testing/buildbot/README.md). The
 JSON files are parsed by the chromium and chromium_trybot recipes, and describe
 two basic types of tests: