[Android] Remove some obsoleted lint ignores

These classes were ignored for not having @Override annotation, now they
all properly annotated. Should be fine to remove the exceptions.

Bug: 635567
Change-Id: Iaf5c99dddefed47d6117cbcbfa22084a5af6fcef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1677128
Commit-Queue: Peter Wen <wnwen@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672484}

build/android/lint/suppressions.xml

@@ -245,20 +245,6 @@ Still reading?
     <ignore path="AndroidManifest.xml"/>
   </issue>
   <issue id="Overdraw" severity="ignore"/>
-  <issue id="Override">
-    <!-- TODO(crbug.com/635567): Fix this properly. -->
-    <ignore regexp="org/chromium/content/browser/input/ThreadedInputConnection.class"/>
-    <!-- TODO(crbug.com/635567): Fix this properly. -->
-    <ignore regexp="com/android/webview/chromium/ContentSettingsAdapter.class"/>
-    <!-- TODO(crbug.com/635567): Fix this properly. -->
-    <ignore regexp="com/android/webview/chromium/ServiceWorkerControllerAdapter.class"/>
-    <!-- TODO(crbug.com/635567): Fix this properly. -->
-    <ignore regexp="com/android/webview/chromium/ServiceWorkerSettingsAdapter.class"/>
-    <!-- TODO(crbug.com/635567): Fix this properly. -->
-    <ignore regexp="org/chromium/chrome/browser/ChromeActivity.class"/>
-    <!-- TODO(crbug.com/635567): Fix this properly. -->
-    <ignore regexp="org/chromium/chrome/browser/ChromeTabbedActivity.class"/>
-  </issue>
   <issue id="PackageManagerGetSignatures">
     <ignore regexp="chrome/android/webapk/libs/client/src/org/chromium/webapk/lib/client/WebApkValidator.java"/>
     <ignore regexp="chrome/android/java/src/org/chromium/chrome/browser/browserservices/OriginVerifier.java"/>