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Previously, the string positions were calculated then used to replace
parts of the string left to right, which produced the wrong string when
code was added earlier in the file causing the messages to be logged
from a four-digit line number in frame_impl.cc. (It would have also
failed had the function been moved to the beginning of the file and had
a two-digit line number.)

Bug: 1136681
Change-Id: Ia5e9a7f11a676d8fc538a19322274ae66e47d9a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2573198
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834030}