Revert "[scheduler] Replace DCHECK for frozen and visible state with DumpWithoutCrashing"

This reverts commit fd47d8d8.

Reason for revert: Collected sufficient initial crash reports.

Original change's description:
> [scheduler] Replace DCHECK for frozen and visible state with DumpWithoutCrashing
> 
> Changing the DCHECK that checks for the page scheduler being frozen when
> the page is visible to DumpWithoutCrashing to collect more crash dump data.
> 
> Bug: 873214
> Change-Id: I0f10ef13b0cf790cb38189273adf1ddc03030fc2
> Reviewed-on: https://chromium-review.googlesource.com/1172709
> Commit-Queue: Scott Haseley <shaseley@google.com>
> Reviewed-by: Alexander Timin <altimin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#582713}

TBR=altimin@chromium.org,shaseley@google.com

Change-Id: If15864678725a3939f5e0e03ddd4bcb97d220dcf
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 873214
Reviewed-on: https://chromium-review.googlesource.com/1175011Reviewed-by: Nate Chapin <japhet@chromium.org>
Commit-Queue: Scott Haseley <shaseley@google.com>
Cr-Commit-Position: refs/heads/master@{#582996}

third_party/blink/renderer/platform/scheduler/main_thread/frame_scheduler_impl.cc

@@ -8,7 +8,6 @@
 #include <set>
 #include <string>
 
-#include "base/debug/dump_without_crashing.h"
 #include "base/metrics/field_trial_params.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/trace_event/blame_context.h"
@@ -705,10 +704,6 @@ SchedulingLifecycleState FrameSchedulerImpl::CalculateLifecycleState(
   if (parent_page_scheduler_->IsFrozen() &&
       !parent_page_scheduler_->KeepActive()) {
     DCHECK(!parent_page_scheduler_->IsPageVisible());
-    // TODO(crbug.com/873214): Remove this after collecting sufficient crash
-    // data.
-    if (parent_page_scheduler_->IsPageVisible())
-      base::debug::DumpWithoutCrashing();
     return SchedulingLifecycleState::kStopped;
   }
   if (subresource_loading_paused_ && type == ObserverType::kLoader)