Revert "Land http://codereview.chromium.org/6869009 for the third time."

Revert "Land http://codereview.chromium.org/6869009 for the third time."

This reverts commit d4ff483fbf60aad0b49fddd1937774edb3ba1d7e.

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Introduce the ANNOTATE_LEAKING_OBJECT_PTR annotation that can be used to mark
heap allocated objects as intentionally leaked ones.
Annotate the histograms produced by {Histogram,BooleanHistogram,LinearHistogram,CustomHistogram}::FactoryGet(), as leaked.

Rename StatsHistogram::StatsHistogramFactoryGet to StatsHistogram::FactoryGet, annotate the result as leaky, update the suppressions.

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TBR=glider@chromium.org
TEST=HistogramTest.RecordedStartupTest and WebSocketTest.ServerSentData in heapchecker bot wont hang.
BUG=79322
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=86853