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Many of these functions are called with string literals.
This leads to two problems:
- Implicit construction of std::string generates a
  surprising amount of code, since STL code is often
  inlined.
- We construct a temporary string, immediately copy it,
  and then throw away the original temporary.

Effect of this CL on an official Linux binary:
 before: 100.41 MiB
  after: 99.56 MiB

BUG=none

Review-Url: https://codereview.chromium.org/2278723003
Cr-Commit-Position: refs/heads/master@{#414450}