Reason for revert: Revert due breaking other clients. Original issue's description: > Made EglBase an abstract class and cleaned up. > Adds EglBase10 that implemenents EglBase for EGL 1.0 > > BUG=webrtc:4993 > TBR=glaznew@webrtc.org > > Committed: https://crrev.com/3207916f35ded33f586774e2c98d4d0089fe3c6e > Cr-Commit-Position: refs/heads/master@{#11011} TBR=magjed@webrtc.org NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=webrtc:4993 Review URL: https://codereview.webrtc.org/1522073002 Cr-Commit-Position: refs/heads/master@{#11013}