Don't mark inline functions in SkString.h as static.
Don't mark inline functions in SkString.h as static.

This can generate spurious warnings like:

  In included file: unused function 'SkStrStartsWith'
  ../../third_party/skia/include/core/SkString.h:23:13: note: error occurred here
  [-Wunused-function]

Change-Id: I4bdfc054d1d24dddf2f8ed68b0a8ebd2cb1a746b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/217986
Commit-Queue: Jeremy Roman <05853bd7e6af82658f882905469512bffcab1902@chromium.org>
Commit-Queue: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@google.com>
Reviewed-by: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@google.com>

aosp-mirror/platform_external_skia,HalCanary/skia-hc,google/skia,aosp-mirror/platform_external_skia,google/skia,HalCanary/skia-hc,HalCanary/skia-hc,google/skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,google/skia,HalCanary/skia-hc,HalCanary/skia-hc,HalCanary/skia-hc,HalCanary/skia-hc,google/skia,aosp-mirror/platform_external_skia,google/skia,HalCanary/skia-hc