www-client/chromium: fix build with -O3

www-client/chromium: fix build with -O3

In third_party/angle/src/libANGLE/validationES.cpp three specializations
are declared for ValidateSamplerParameterBase(). Two implicit
specializations are created in ValidateSamplerParameterfvRobustANGLE()
and ValidateSamplerParameterIivRobustANGLE(). However, with
-finline-functions (default enabled with -O3) those two implicit
symbols are optimized out. In the end linking fails with
unresolved references, because functions in
third_party/angle/src/libANGLE/validationES3.cpp use both
specializations.

Closes: https://bugs.gentoo.org/681870
Closes: https://github.com/gentoo/gentoo/pull/12312
Package-Manager: Portage-2.3.66, Repoman-2.3.11
Signed-off-by: Stephan Hartmann <stha09@googlemail.com>
Signed-off-by: Mike Gilbert <floppym@gentoo.org>