Revert "Roll src/third_party/perfetto/ a6f6a3133..d1fe1ee42 (39 commits)"

This reverts commit 49d49cc1.

Reason for revert: Broke all libFuzzer and coverage builds.
See
https://ci.chromium.org/buildbot/chromium.fyi/Libfuzzer%20Upload%20Linux%20ASan/13325

Original change's description:
> Roll src/third_party/perfetto/ a6f6a3133..d1fe1ee42 (39 commits)
> 
> https://android.googlesource.com/platform/external/perfetto.git/+log/a6f6a3133cf7..d1fe1ee42456
> 
> $ git log a6f6a3133..d1fe1ee42 --date=short --no-merges --format='%ad %ae %s'
> 2018-05-21 oysteine Re-enabled TraceWriter flushing on destruction
> 2018-05-21 hjd Fix mac build
> 2018-05-21 fmayer Tune values for ftrace_largebuffer.
> 2018-05-21 fmayer Change LOCKDOWN_UNSET to LOCKDOWN_UNCHANGED.
> 2018-05-18 brucedawson Disable features that fail in Chromium builds
> 2018-05-18 fmayer Add test config with larger buffer size.
> 2018-05-18 brucedawson Changes to get Perfetto tracing in Chrome for Windows
> 2018-05-18 fmayer Change wording in trace_to_text output.
> 2018-05-18 fmayer Correctly handle EINTR.
> 2018-05-17 fmayer Output duration of ftrace as well as total trace duration.
> 2018-05-17 primiano Add tdresser@ to ui/OWNERS
> 2018-05-17 dproy Rerun ninja when UI source files change
> 2018-05-17 brucedawson Fix Perfetto export definitions for Windows
> 2018-05-17 primiano Fix fuzzers and reduce noise from ftrace_parser unittest
> 2018-05-16 primiano Add skeleton for UI (Node + TypeScript + WASM  + build integration)
> 2018-05-08 primiano Clean up some TODOs and use PageAllocator in CpuReader
> 2018-05-15 lalitm perfetto: update docs to keep in sync with other copies
> 2018-05-15 fmayer Add -b flag to tools/tmux to run in background.
> 2018-05-15 primiano Roll GN, clang and libc++ to match chromium revisions
> 2018-05-14 primiano Fix mac build, make pipe_stats linux-only
> 2018-05-14 brucedawson Enable protozero tests on Windows
> 2018-05-14 brucedawson Use relative path to import perfetto.gni
> 2018-05-10 brucedawson Get page allocator working on Windows
> 2018-05-10 fmayer Add sanity check for page size.
> 2018-05-10 primiano Introduce WASM toolchain
> 2018-05-10 lalitm protos: fix typos for lint to be happy
> 2018-05-09 fmayer Use dynamically read header_page information.
> 2018-05-09 fmayer Add metatracing to trace perfetto itself.
> 2018-05-09 fmayer Add PRESUBMIT to protect whitelist.
> 2018-05-09 fmayer Add compile_commands.json to gitignore.
> 2018-04-30 hjd trace_to_text: Print FtraceStats
> 2018-05-09 fmayer Allow to parse events/header_page.
> 2018-05-08 brucedawson Enable more unit tests on Windows
> 2018-05-08 fmayer Add script to visualize pipestats.
> 2018-05-08 fmayer Add tool to analyze rate of events.
> 2018-05-08 primiano Limit concurrent traces to 5 to prevent stalls in traced_probes
> 2018-05-08 fmayer Temporary workaround for 32-bit crashes.
> 2018-05-04 fmayer Fix off by one.
> 2018-05-03 fmayer Increase ftrace buffer. Decrease i/o scan batches.
> 
> Created with:
>   roll-dep src/third_party/perfetto
> 
> Change-Id: I0e085bac9d14b1c55b1be527cd80e4f206240308
> Reviewed-on: https://chromium-review.googlesource.com/1068622
> Commit-Queue: Primiano Tucci <primiano@chromium.org>
> Reviewed-by: Primiano Tucci <primiano@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#560522}

TBR=primiano@chromium.org,oysteine@chromium.org

Change-Id: I485d0383fa20161af541139f022f42776ba4bb08
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/1069670Reviewed-by: Abhishek Arya <inferno@chromium.org>
Commit-Queue: Abhishek Arya <inferno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560808}

DEPS

@@ -860,7 +860,7 @@ deps = {
   },
 
   'src/third_party/perfetto':
-    Var('android_git') + '/platform/external/perfetto.git' + '@' +  'd1fe1ee42456cf6f8d1387fa88fae63b70d7357f',
+    Var('android_git') + '/platform/external/perfetto.git' + '@' +  'a6f6a3133cf76a54b2d9fa6c40605e6919c93d66',
 
   'src/third_party/perl': {
       'url': Var('chromium_git') + '/chromium/deps/perl.git' + '@' + 'ac0d98b5cee6c024b0cffeb4f8f45b6fc5ccdb78',