Correct two policy names in histograms.

This is the result of running
tools/metrics/histograms/update_policies.py in a clean branch. Both
of these changes appear to be correct based on the names in
components/policy/resources/policy_templates.json.

This allows future users of update_policies.py to get a clean diff.

Change-Id: I28245240d594e1c82481663aa17a9ff099a1864f
Bug: None
Reviewed-on: https://chromium-review.googlesource.com/747691Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513044}

tools/metrics/histograms/enums.xml

@@ -11825,9 +11825,9 @@ uploading your change for review.  These are checked by presubmit scripts.
   <int value="387" label="DeviceNativePrintersAccessMode"/>
   <int value="388" label="DeviceNativePrintersBlacklist"/>
   <int value="389" label="DeviceNativePrintersWhitelist"/>
-  <int value="390" label="DeviceTPMFirmwareUpdateSettings"/>
+  <int value="390" label="TPMFirmwareUpdateSettings"/>
   <int value="391" label="RunAllFlashInAllowMode"/>
-  <int value="392" label="AutoFillCreditCardEnabled"/>
+  <int value="392" label="AutofillCreditCardEnabled"/>
   <int value="393" label="NtlmV2Enabled"/>
   <int value="394" label="MinimumRequiredChromeVersion"/>
 </enum>