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There were two issues with clang:

- Clang emits .data.rel.ro.local for local struct values with
  an initializer, which lets the linker to emit a few
  relocation info.
- In debug build, clang uses memcpy to copy a structure with
  five members. Neither -fno-builtin nor -ffreestanding did
  not prevent this issue.
- In release build, clang translates for-loop based zero copy
  to memset.

This patch initializes all structures without initializers
or copy. This patch works with GYP_DEFINES=clang=0.

To make sure we will not add memcpy or something in future,
we will build libc_free.nexe with -Wl,--no-undefined.

This also reverts

https://codereview.chromium.org/386543002

to enable the disabled tests.

BUG=392768
TEST=./out/Debug/browser_tests --gtest_filter='*NonSfi*Messaging*'

Review URL: https://codereview.chromium.org/381883002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282697 0039d316-1c4b-4281-b951-d872f2087c98