DevTools: Use new static CpuProfiler::CollectSample API.

It allows collect the sample in all the running CPU profilers.

BUG=721099

Change-Id: I8c80c9543bb826b67b8f7ddf6b2984cb54d61fbb
Reviewed-on: https://chromium-review.googlesource.com/764793Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515746}

third_party/WebKit/Source/core/inspector/InspectorTraceEvents.cpp

@@ -88,7 +88,7 @@ void SetCallStack(TracedValue* value) {
   // So we collect the top frame with SourceLocation::capture() to get the
   // binding call site info.
   SourceLocation::Capture()->ToTracedValue(value, "stackTrace");
-  v8::Isolate::GetCurrent()->GetCpuProfiler()->CollectSample();
+  v8::CpuProfiler::CollectSample(v8::Isolate::GetCurrent());
 }
 
 void InspectorTraceEvents::Init(CoreProbeSink* instrumenting_agents,