I get \"Native crash at /system/lib/libwebviewchromium.so\" errors many times for android 4.4+. There was no such problem before 4.4.
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This could be caused from a graphic memory bug, so you can try to disable some CSS using any -CSS webkit-transform like " -webkit-transform: rotate(0deg) scaleX(1) scaleY(1); ". (I saw this same bug on iOS if you load too many data in GPU memory).