Removes deprecated functions from the following files:

test/cctest/test-object-observe.cc
test/cctest/test-parsing.cc
test/cctest/test-platform.cc
test/cctest/test-platform-linux.cc
test/cctest/test-platform-win32.cc
test/cctest/test-profile-generator.cc
test/cctest/test-random-number-generator.cc
test/cctest/test-regexp.cc
test/cctest/test-reloc-info.cc
test/cctest/test-representation.cc
test/cctest/test-sampler-api.cc
test/cctest/test-serialize.cc
test/cctest/test-simd.cc
test/cctest/test-slots-buffer.cc
test/cctest/test-spaces.cc
test/cctest/test-strings.cc
test/cctest/test-strtod.cc
test/cctest/test-symbols.cc
test/cctest/test-threads.cc

BUG=v8:4134
LOG=n

Review URL: https://codereview.chromium.org/1371363006

Cr-Commit-Position: refs/heads/master@{#31173}