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This CL switches over to using Microsoft Visual Studio 2015 by default on Windows. This large effort is described in more detail in https://crbug.com/440500. Change log:db8316d..6a56b54Full diff:db8316d..6a56b54No dependencies changed. No update to Clang. TBR=tommi@webrtc.org Review URL: https://codereview.webrtc.org/1792633002 . Cr-Commit-Position: refs/heads/master@{#11974}