Remove AppListMixer field trial.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index b3c9b5e45debe7353755bccd5386fe912c2c9951..339a26e2741e440d42d01c1a72853cb453944fbf 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -6406,12 +6406,6 @@ Keep your key file in a safe place. You will need it to create new versions of y
         <message name="IDS_FLAGS_CENTERED_APP_LIST_DESCRIPTION" desc="Description of the flag to center the app launcher and make it wide instead of tall.">
           Positions the App Launcher in the center of the screen with a landscape aspect.
         </message>
-        <message name="IDS_FLAGS_NEW_APP_LIST_MIXER_NAME" desc="Name of the flag to enable the new mixing algorithm in the app launcher.">
-          New App Launcher mixer algorithm
-        </message>
-        <message name="IDS_FLAGS_NEW_APP_LIST_MIXER_DESCRIPTION" desc="Description of the flag to enable the new mixing algorithm in the app launcher.">
-          This enables a new search result selecting and ranking algorithm in the App Launcher.
-        </message>
       </if>
       <if expr="chromeos">
         <message name="IDS_FLAGS_FIRST_RUN_UI_TRANSITIONS_NAME" desc="Name of the flag to enable animated transitions for the first-run tutorial.">