Unsymbolized call stack is hard to interpret:


Uninitialized bytes in __interceptor_strlen at offset 20 inside [0x71f000001c00, 3280)
==21012==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x7f93764f24c8  (/usr/lib/x86_64-linux-gnu/mesa/libGL.so.1+0x194c8)
    #1 0x7f93764f7599  (/usr/lib/x86_64-linux-gnu/mesa/libGL.so.1+0x1e599)
    #2 0x7f93764f3f3a  (/usr/lib/x86_64-linux-gnu/mesa/libGL.so.1+0x1af3a)
    #3 0x7f93764f40ee  (/usr/lib/x86_64-linux-gnu/mesa/libGL.so.1+0x1b0ee)
    #4 0xa187a57  (/b/s/w/ir/out/Release/content_shell+0xa187a57)
    #5 0xa16b030  (/b/s/w/ir/out/Release/content_shell+0xa16b030)
    #6 0xa3a85c4  (/b/s/w/ir/out/Release/content_shell+0xa3a85c4)
    #7 0xa3a3dfc  (/b/s/w/ir/out/Release/content_shell+0xa3a3dfc)
    #8 0xa3a3512  (/b/s/w/ir/out/Release/content_shell+0xa3a3512)
    #9 0xa3a393c  (/b/s/w/ir/out/Release/content_shell+0xa3a393c)
    #10 0xa4478d2  (/b/s/w/ir/out/Release/content_shell+0xa4478d2)
    #11 0x110a114d  (/b/s/w/ir/out/Release/content_shell+0x110a114d)
    #12 0x48af297  (/b/s/w/ir/out/Release/content_shell+0x48af297)
    #13 0x48b2398  (/b/s/w/ir/out/Release/content_shell+0x48b2398)
    #14 0xbe2d468  (/b/s/w/ir/out/Release/content_shell+0xbe2d468)
    #15 0x183c19e  (/b/s/w/ir/out/Release/content_shell+0x183c19e)
    #16 0x4a97b7  (/b/s/w/ir/out/Release/content_shell+0x4a97b7)
    #17 0x7f937e9e0f44  (/lib/x86_64-linux-gnu/libc.so.6+0x21f44)
    #18 0x43d29a  (/b/s/w/ir/out/Release/content_shell+0x43d29a)
  Uninitialized value was created by a heap allocation
    #0 0x46090d  (/b/s/w/ir/out/Release/content_shell+0x46090d)
    #1 0x7f93764f7ae3  (/usr/lib/x86_64-linux-gnu/mesa/libGL.so.1+0x1eae3)
SUMMARY: MemorySanitizer: use-of-uninitialized-value (/usr/lib/x86_64-linux-gnu/mesa/libGL.so.1+0x194c8) 
Exiting

Reverting https://chromium-review.googlesource.com/c/chromium/src/+/633705

Revert hasn't landed but failure doesn't happen anymore.