milestone_apk_sizes.py: Measure webview bundles

Rather than .apk

Bug: 1091256
Change-Id: I92d1b140f17b30779d15ff2137d4ebf847e88ef3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2459939
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815249}

tools/binary_size/milestone_apk_sizes.py

@@ -122,17 +122,17 @@ def _DownloadAndAnalyze(signed_prefix, unsigned_prefix, staging_dir):
     artifacts.append(_Artifact(prefix, name, staging_dir))
     return artifacts[-1]
 
-  webview = make_artifact('arm/AndroidWebview.apk')
-  webview64 = make_artifact('arm_64/AndroidWebview.apk')
+  webview = make_artifact('arm/AndroidWebviewStable.aab')
+  webview64 = make_artifact('arm_64/AndroidWebviewStable.aab')
   chrome_modern = make_artifact('arm/ChromeModernStable.aab')
   chrome_modern64 = make_artifact('arm_64/ChromeModernStable.aab')
   monochrome = make_artifact('arm/MonochromeStable.aab')
   monochrome64 = make_artifact('arm_64/MonochromeStable.aab')
   trichrome_chrome = make_artifact('arm/TrichromeChromeGoogleStable.aab')
-  trichrome_webview = make_artifact('arm/TrichromeWebViewGoogleStable.apk')
+  trichrome_webview = make_artifact('arm/TrichromeWebViewGoogleStable.aab')
   trichrome_library = make_artifact('arm/TrichromeLibraryGoogleStable.apk')
   trichrome64_chrome = make_artifact('arm_64/TrichromeChromeGoogleStable.aab')
-  trichrome64_webview = make_artifact('arm_64/TrichromeWebViewGoogleStable.apk')
+  trichrome64_webview = make_artifact('arm_64/TrichromeWebViewGoogleStable.aab')
   trichrome64_library = make_artifact('arm_64/TrichromeLibraryGoogleStable.apk')
 
   trichrome_system_apks = [