* perf: use base::StringPiece in InclusionStatusToString()
The strings are all build-time constants and this is a private function
* perf: use base::StringPiece in ErrorCodeToString()
The strings are all build-time constants and this is a private function
* perf: use base::StringPiece in MessageSourceToString()
The strings are all build-time constants and this is a private function
* perf: use base::StringPiece in CursorTypeToString()
The strings are all build-time constants and this is a private function
* perf: use base::StringPiece in MediaStreamTypeToString()
The strings are all build-time constants and this is a private function
* perf: use base::StringPiece in ModifiersToArray()
The strings are all build-time constants and this is a private function
* perf: use base::StringPiece in WebFrameRenderer::MaybeGetRenderFrame()
The strings are all build-time constants and this is a private function