[gcc] Fix compiler warning turned into errors while compiling default_header_painter_unittest
[gcc] Fix compiler warning turned into errors while compiling default_header_painter_unittest

With gcc toolchain, we get following error with EXPECT_FALSE

error: converting ‘false’ to pointer type for argument 1 of
‘char testing::internal::IsNullLiteralHelper(testing::internal::Secret*)’ [-Werror=conversion-null]

Changing EXPECT_EQ(...) to EXPECT_FALSE() fixes the error.

NOTRY=true
Adding NOTRY as linux_chormium_clobber_rel_ng bot is failing even without the patch.

R=jamescook@chromium.org, benwells@chromium.org

Review URL: https://codereview.chromium.org/948703002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#317772}

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