Update git submodules

* Update platform/external/perfetto from branch 'master'
  to 5a9d84436fccfcb0eaaad6f8c40c851b12c24420
  - Merge "Revert "[fuchsia] Enable Perfetto IPC support for Fuchsia.""
  - Revert "[fuchsia] Enable Perfetto IPC support for Fuchsia."
    
    This reverts commit 440948d0b2e4741dd157545d5d8528644f03dc30.
    
    Reason for revert: broke perfetto roll into chromium, see below.
    
    First roll failure: https://chromium-review.googlesource.com/c/chromium/src/+/3656569
    
    Roll fails with crashes in various Perfetto tests on Fuchsia:
    https://ci.chromium.org/ui/p/chromium/builders/try/fuchsia_x64/1194383/overview
    https://ci.chromium.org/ui/p/chromium/builders/try/fuchsia_arm64/1160789/overview
    
    Change-Id: I2b17dca08e1c704d1affe6d45fe929888df39e1e
    
1 file changed