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These functions are always called with string literals, so having the
functions accept Strings means all callers have to perform implicit
conversions.
By modifying the signatures to use 'const char*' for these cases, these
conversion can be avoided (in the callers) and only be performed in the
functions themselves.
This reduces code size by ~70kB (Linux, x86-64, gcc-4.8.2).

Review URL: https://codereview.chromium.org/216633002

git-svn-id: svn://svn.chromium.org/blink/trunk@170304 bbb929c8-8fbe-4397-9dbb-9b2b20218538