Version: tip
OS: Linux x86-64

What steps will reproduce the problem?
(1) Build browser_tests with Control Flow Integrity enabled + diagnostics enabled:
https://www.chromium.org/developers/testing/control-flow-integrity

gn gen out/cfi-diag '--args=is_debug=false is_cfi=true use_cfi_cast=true use_cfi_diag=true' --check
build/download_gold_plugin.py
ninja -C out/cfi-diag browser_tests # Linking will take about an hour; we're working to make it faster

(2) Run it:

../../chrome/browser/extensions/process_manager_browsertest.cc:919:7: runtime error: control flow integrity check for type 'guest_view::TestGuestViewManager' failed during base-to-derived cast (vtable address 0x000008ecc5a0)
0x000008ecc5a0: note: vtable is of type 'guest_view::GuestViewManager'
 00 00 00 00  f0 14 9e 04 00 00 00 00  90 15 9e 04 00 00 00 00  b0 15 9e 04 00 00 00 00  e0 15 9e 04
              ^ 
[17487:17487:1024/173618:ERROR:gles2_cmd_decoder.cc(16763)] [.DisplayCompositor-0x3bfba5d77e00]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[17487:17487:1024/173618:ERROR:gles2_cmd_decoder.cc(9395)] [.DisplayCompositor-0x3bfba5d77e00]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[17487:17487:1024/173618:ERROR:gles2_cmd_decoder.cc(16763)] [.DisplayCompositor-0x3bfba5d77e00]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[17487:17487:1024/173618:ERROR:gles2_cmd_decoder.cc(9395)] [.DisplayCompositor-0x3bfba5d77e00]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[17276:17496:1024/173618:WARNING:embedded_test_server.cc(201)] Request not handled. Returning 404: /favicon.ico