fix heapchecker build (allocator linking)

I don't fully understand -rdynamic (http://gcc.gnu.org/onlinedocs/gcc/Link-Options.html) but it seems like that's why the heapchecker build works (it turns -rdynamic on in build/common.gypi), so this seems like a reasonable workaround for the test targets. (?)

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BUG=263316

Review URL: https://chromiumcodereview.appspot.com/19862006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@213213 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed