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1) Skip the report&suppression frames starting from
    testing::internal::BlahExceptions and RunnableMethod
   as they usually have nothing to do with the error but significantly increase
   the size of the suppressions
2) Drop anonymous namespace prefixes
3) Unify boring callers between error reporting code and suppression generation

TEST=ran locally on base_unittests Sanity tests with sanity suppressions removed
Review URL: http://codereview.chromium.org/7665001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@97116 0039d316-1c4b-4281-b951-d872f2087c98