[aw] Extend WebView API histograms expiry date

Extend the duration of Android.WebView.AndroidX.ApiCall and
WebView.ApiCall. These are core WebView API metrics, to be used both as
a measure of success or to guide deprecation of unused methods.

Bug: 1160898
Test: N/A
Change-Id: I821d65343fbda189ff941df12493e2ae956541ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2622372
Auto-Submit: Laís Minchillo <laisminchillo@chromium.org>
Commit-Queue: Laís Minchillo <laisminchillo@chromium.org>
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Cr-Commit-Position: refs/heads/master@{#843514}

tools/metrics/histograms/histograms_xml/android/histograms.xml

@@ -2228,7 +2228,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Android.WebView.AndroidX.ApiCall" enum="AndroidXWebkitApiCall"
-    expires_after="2021-01-29">
+    expires_after="2022-01-31">
   <owner>laisminchillo@chromium.org</owner>
   <owner>src/android_webview/OWNERS</owner>
   <summary>

tools/metrics/histograms/histograms_xml/others/histograms.xml

@@ -18518,8 +18518,7 @@ regressions. -->
 </histogram>
 
 <histogram name="WebView.ApiCall" enum="WebViewApiCall"
-    expires_after="2021-07-24">
-  <owner>changwan@chromium.org</owner>
+    expires_after="2022-01-31">
   <owner>ntfschr@chromium.org</owner>
   <owner>src/android_webview/OWNERS</owner>
   <summary>Records calls to WebView APIs in WebViewChromium.</summary>