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Now, NaCl supports to build x86-32 nonsfi binary even with target_arch=x64,
so this CL enables browser_tests for PPAPI.

BUG=358465
TEST=browser_tests --gtest_filter=*Transitional* locally. Run trybots.
CQ_EXTRA_TRYBOTS=tryserver.chromium.linux:linux_rel_precise32,linux_arm_compile,linux_arm

Review URL: https://codereview.chromium.org/786273008

Cr-Commit-Position: refs/heads/master@{#314148}