[WebProfiler] added support for window.fetch calls in ajax section#19576

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ivoba wants to merge 4 commits intosymfony:masterfrom

freshcells:ticket_17444

Commits on Aug 9, 2016

added support for window.fetch calls in ajax section
ivoba
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Commits on Sep 29, 2016

applied suggested fixes:
ivoba
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Commits on Oct 5, 2016

added type to profiler table, use 2nd argument instead of catch, using fetch signature instead of arguments
ivoba
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fixed polyfill detect
ivoba
committed