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Reverts "[Impeller] support GLES 3.0 MSAA without extension. (#56705)" #56741
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Reverts: #56705
Initiated by: jonahwilliams
Reason for reverting: goldens occassionally fail to render anything.
Original PR Author: jonahwilliams
Reviewed By: {gaaclarke}
This change reverts the following previous change:
Adds multisampling support for GLES devices without GL_EXT_multisampled_render_to_texture provided they are at least GLES 3.0 to support mutlisampled render buffers.
Fixes flutter/flutter#158360
Fixes flutter/flutter#157951
TBD: should we prefer renderbuffer 3.0 approach over multisample_render_to_texture?