Reason for revert: Breaks downstream gtest usage. Original issue's description: > Remove the rtc_relative_path GYP variable and similar defines > > This is a reland of https://codereview.webrtc.org/1903553003/ but with > the SRTP changes removed, since they're needed downstream. > > The defines that can be used to alter the include paths for Expat and gtest > are no longer needed in WebRTC or Chromium. Remove them to simplify GYP. > > Removed defines: > EXPAT_RELATIVE_PATH > GTEST_RELATIVE_PATH > > They're all set in the Chromium build so this shouldn't affect Chromium: > https://code.google.com/p/chromium/codesearch#chromium/src/third_party/libjingle/libjingle.gyp > > BUG=webrtc:4256 > NOTRY=True > NOPRESUBMIT=True > TBR=perkj@webrtc.org > > Committed: https://crrev.com/081254f2c62037d016f9fc961764c6f01cb095da > Cr-Commit-Position: refs/heads/master@{#12536} TBR=perkj@webrtc.org,kjellander@webrtc.org # Not skipping CQ checks because original CL landed more than 1 days ago. BUG=webrtc:4256 Review-Url: https://codereview.webrtc.org/1945803003 Cr-Commit-Position: refs/heads/master@{#12622}