[Refactor] Remove unused WebappInfo#isInitialized()

BUG=None

Change-Id: Ib9d60302b836ef28afe75205dc13f70947214b93
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1752547
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686717}

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappInfo.java

@@ -55,7 +55,6 @@ public class WebappInfo {
         }
     }
 
-    private boolean mIsInitialized;
     private String mId;
     private Icon mIcon;
     private Uri mUri;
@@ -203,16 +202,11 @@ public class WebappInfo {
         mIsIconGenerated = isIconGenerated;
         mIsIconAdaptive = isIconAdaptive;
         mForceNavigation = forceNavigation;
-        mIsInitialized = mUri != null;
     }
 
     protected WebappInfo() {
     }
 
-    public boolean isInitialized() {
-        return mIsInitialized;
-    }
-
     public String id() {
         return mId;
     }