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This reverts commit 43a4f5d0.

Reason for revert: Looks like the changes to thread_profiler broke some Android tests? (ToastHWATest): https://ci.chromium.org/buildbot/chromium.android/Lollipop%20Phone%20Tester/19475

[FATAL:thread_profiler.cc(154)] Check failed: metrics::CallStackProfileParams::BROWSER_PROCESS != GetProcess() (1 vs. 1)

Reverting.  Sorry!


Original change's description:
> Sampling profiler: disable GPU main thread profiling on OS X
> 
> Disabling pending a resolution to crashes observed in the associated
> bug.
> 
> This change also removes the unused
> GetSamplingParamsForCurrentProcess function and adapts
> IsProfilerEnabledForCurrentProcess to operate on the current process
> and specified thread.
> 
> The call to IsProfilerEnabledForCurrentProcess is also removed
> from SetServiceManagerConnectorForChildProcess since that function is
> only invoked in processes supporting the profiler.
> 
> Bug: 774682
> Change-Id: Ibbc6f1bd9348ba09a3ee4db2e1595411617f1ccd
> Reviewed-on: https://chromium-review.googlesource.com/962937
> Commit-Queue: Mike Wittman <wittman@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Leonard Grey <lgrey@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#543520}

TBR=sky@chromium.org,wittman@chromium.org,lgrey@chromium.org

Change-Id: I2ecac49a6e14de7f620dc0096ce229f25057c810
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 774682
Reviewed-on: https://chromium-review.googlesource.com/965821Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543613}