Remove some unused variables

These variables are now redefined in DownloadUtils

Change-Id: Id5fe3a276c1ce5f8add8a9b1906ea3573b023565
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808795Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697321}

chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java

@@ -71,7 +71,6 @@ import java.io.File;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Iterator;
@@ -117,18 +116,6 @@ public class DownloadManagerService
     private static final String PREF_IS_DOWNLOAD_HOME_ENABLED =
             "org.chromium.chrome.browser.download.IS_DOWNLOAD_HOME_ENABLED";
 
-    // Set will be more expensive to initialize, so use an ArrayList here.
-    private static final List<String> MIME_TYPES_TO_OPEN = new ArrayList<String>(Arrays.asList(
-            OMADownloadHandler.OMA_DOWNLOAD_DESCRIPTOR_MIME,
-            "application/pdf",
-            "application/x-x509-ca-cert",
-            "application/x-x509-user-cert",
-            "application/x-x509-server-cert",
-            "application/x-pkcs12",
-            "application/application/x-pem-file",
-            "application/pkix-cert",
-            "application/x-wifi-config"));
-
     private static final Set<String> sFirstSeenDownloadIds = new HashSet<String>();
     private static final Set<String> sBackgroundDownloadIds = new HashSet<String>();