Fix incorrect enum label for TranslateInitiationStatus.

The enum value 19 corresponds to
INITIATION_STATUS_SHOW_UI_PREDEFINED_TARGET_LANGUAGE in the code, but
before this CL it was incorrectly labelled as "Aborted by CLD and
HTML/content language conflict". This CL fixes this label.

Change-Id: I05751f98b35760005339eb2115c8a78544300837
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532020
Commit-Queue: Scott Little <sclittle@chromium.org>
Commit-Queue: Megan Jablonski <megjablon@chromium.org>
Auto-Submit: Scott Little <sclittle@chromium.org>
Reviewed-by: Megan Jablonski <megjablon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826567}

tools/metrics/histograms/enums.xml

@@ -73339,7 +73339,7 @@ Full version information for the fingerprint enum values:
   <int value="16" label="Decision made to create infobar on Android"/>
   <int value="17" label="Show omnibar icon to the user"/>
   <int value="18" label="Suppress infobar but show omnibar icon"/>
-  <int value="19" label="Aborted by CLD and HTML/content language conflict"/>
+  <int value="19" label="Show infobar for predefined target language"/>
   <int value="20" label="Disabled because network unavailable"/>
   <int value="21" label="Page state doesn't require translation"/>
   <int value="22"