Spellcheck cleanup: chrome/common/owners and obsolete java switch

Delete obsolete references to spellcheck files and a switch.

The files listed in chrome/common/owners have been moved to
components/spellcheck/common and are covered by an owners
file there.

The spellcheck switch in ChromeSwitches.java is not used
anywhere (in fact the flag has been removed in
crrev.com/2284583002).

BUG=629609

Review-Url: https://codereview.chromium.org/2341653004
Cr-Commit-Position: refs/heads/master@{#419464}

chrome/android/java/src/org/chromium/chrome/browser/ChromeSwitches.java

@@ -125,12 +125,6 @@ public abstract class ChromeSwitches {
      */
     public static final String DISABLE_DOMAIN_RELIABILITY = "disable-domain-reliability";
 
-    /**
-     * Enable use of Android's built-in spellchecker.
-     * Native switch - switches::kEnableAndroidSpellChecker
-     */
-    public static final String ENABLE_ANDROID_SPELLCHECKER = "enable-android-spellchecker";
-
     /**
      * Specifies Android phone page loading progress bar animation.
      * Native switch - switches::kProgressBarAnimation

chrome/common/OWNERS

@@ -19,16 +19,6 @@ per-file *_messages*.h=file://ipc/SECURITY_OWNERS
 per-file *.mojom=set noparent
 per-file *.mojom=file://ipc/SECURITY_OWNERS
 
-# Spellcheck files. Not using spellcheck* since it covers IPC messages too.
-per-file spellcheck_bdict_language.h=groby@chromium.org
-per-file spellcheck_bdict_language.h=rouslan@chromium.org
-per-file spellcheck_common*=groby@chromium.org
-per-file spellcheck_common*=rouslan@chromium.org
-per-file spellcheck_marker.h=groby@chromium.org
-per-file spellcheck_marker.h=rouslan@chromium.org
-per-file spellcheck_result.h=groby@chromium.org
-per-file spellcheck_result.h=rouslan@chromium.org
-
 #Content settings
 per-file content_settings*=markusheintz@chromium.org