[Chromium] Remove support for TRACE_EVENT_IF_LONGER_THANx macros
https://bugs.webkit.org/show_bug.cgi?id=104784

Reviewed by Pavel Feldman.

Source/Platform:

- remove threshold and id of related begin event from arguments of addTraceEvent()
- do not return the index of added event from addTraceEvent()

* chromium/public/Platform.h:
(Platform):
(WebKit::Platform::addTraceEvent):

Source/WebCore:

- removed TRACE_EVENT_IF_LONGER_THANx macros;
- changed addTraceEvent() to return void, as we no longer need the index of added event.

* platform/EventTracer.h:
(EventTracer):
* platform/chromium/EventTracerChromium.cpp:
(WebCore::EventTracer::addTraceEvent):
* platform/chromium/TraceEvent.h:
(TraceEvent):
(WebCore::TraceEvent::addTraceEvent):
(WebCore::TraceEvent::TraceEndOnScopeClose::addEventIfEnabled):
(Data):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk/Source/Platform/chromium/public@137896 268f45cc-cd09-0410-ab3c-d52691b4dbfc