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Without this, the compiler emits ctor/dtor code to convert constant
strings to std::string making the call about 100x larger in size and
almost 2x the size of a caching macro instantiation.

According to the Android binary-size try-bot, saves about 4K...

Specifics:
-4,096 bytes main lib size
-4,738 bytes normalized apk size
InstallSize:
-4,122 bytes APK size
-4,122 bytes Estimated installed size (Android Go)
-4,122 bytes Estimated installed size
InstallBreakdown (-4,066 bytes):
+28 bytes unwind_cfi (dev and canary only) size
-4,096 bytes Native code size
+2 bytes Package metadata size


Bug: 944842
Change-Id: I4b9bdff28acfa7b0e5146de74fd922a5c8245b4e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1630968Reviewed-by: Nik Bhagat <nikunjb@chromium.org>
Commit-Queue: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663838}