OpenBSD patches for base and build, part 2

base/base.gyp: 
  - exclude test/test_file_util_linux.cc on OpenBSD because of
    missing fdatasync()

base/base.gypi:
  - include linux_util.cc on OpenBSD too
  - exclude some linux specific files from the OpenBSD build
    because the openbsd implementation is different

base/file_util_posix.cc:
  - Use file_util::GetTempDir directly to get the shm dir
    on !linux

base/sys_info_freebsd.cc:
   - return 0 and do a NOTREACHED() in case sysctlbyname() fails

base/sys_info_openbsd.cc:
  - cleanup includes
  - use arraysize() in the sysctl() call
  - implement SysInfo::MaxSharedMemorySize()

build/common.gypi:
  - -Wno-deprecated is C++ only flag so move it to cflags_cc
  - Do not exclude linux specific files, dirs on OpenBSD since
    90% of it is sharable

base/sys_info_linux.cc:
  - DCHECK if the read string is empty
  - Use base::StringToInt64() to convert the string
    to an int64
  - DCHECK if the returned int64 is okay for a size_t
  - call NOTREACHED() and return 0 if fails

BUG=
TEST=runs on linux?


Review URL: http://codereview.chromium.org/8382001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@106984 0039d316-1c4b-4281-b951-d872f2087c98

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