Update story tag for browse:tools:maps:2019

Bug: chromium:1039752
Change-Id: I78c02405c0f146aa862104dd9fd7df634fed71c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1991341
Auto-Submit: Mythri Alle <mythria@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729562}

tools/perf/page_sets/system_health/browsing_stories.py

@@ -1412,7 +1412,7 @@ class GoogleMapsStory2019(_BrowsingStory):
     '''
   SUPPORTED_PLATFORMS = platforms.DESKTOP_ONLY
   TAGS = [story_tags.JAVASCRIPT_HEAVY, story_tags.WEBGL,
-          story_tags.YEAR_2018]
+          story_tags.YEAR_2019]
 
   def _DidLoadDocument(self, action_runner):
     # Click on the search box.

tools/perf/system_health_stories.csv

@@ -75,7 +75,7 @@ browse:tech:discourse_infinite_scroll,,mobile,"2016,infinite_scroll"
 browse:tech:discourse_infinite_scroll:2018,,"desktop,mobile","2018,infinite_scroll"
 browse:tools:earth,Google Earth story:,desktop,"2016,javascript_heavy,webgl"
 browse:tools:maps,Google maps story:,"desktop,mobile","2016,emerging_market,javascript_heavy,webgl"
-browse:tools:maps:2019,Google maps story:,"desktop,mobile","2018,2019,emerging_market,javascript_heavy,webgl"
+browse:tools:maps:2019,Google maps story:,"desktop,mobile","2019,emerging_market,javascript_heavy,webgl"
 browse:tools:sheets:2019,,desktop,"2019,javascript_heavy"
 browse_accessibility:media:youtube,Tests interacting with the YouTube home page.,desktop,"2016,accessibility,keyboard_input"
 browse_accessibility:tech:codesearch:2018,Tests scrolling an element within a page.,desktop,"2018,accessibility,scroll"