Android: Remove JellyBean code from ContextUtils.getProcessName()

We no longer support JellyBean.

Change-Id: I5dfd1af42f2336d91fea91bf6d1a953c6e964769
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1814324Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698944}

base/android/java/src/org/chromium/base/ContextUtils.java

@@ -10,6 +10,7 @@ import android.content.Context;
 import android.content.ContextWrapper;
 import android.content.SharedPreferences;
 import android.content.res.AssetManager;
+import android.os.Build;
 import android.os.Process;
 import android.preference.PreferenceManager;
 
@@ -17,6 +18,7 @@ import androidx.annotation.Nullable;
 
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.base.annotations.MainDex;
+import org.chromium.base.annotations.VerifiesOnP;
 
 /**
  * This class provides Android application context related utility methods.
@@ -25,8 +27,6 @@ import org.chromium.base.annotations.MainDex;
 public class ContextUtils {
     private static final String TAG = "ContextUtils";
     private static Context sApplicationContext;
-    // TODO(agrieve): Remove sProcessName caching when we stop supporting JB.
-    private static String sProcessName;
 
     /**
      * Initialization-on-demand holder. This exists for thread-safe lazy initialization.
@@ -142,24 +142,15 @@ public class ContextUtils {
     }
 
     /** @return The name of the current process. E.g. "org.chromium.chrome:privileged_process0". */
+    @VerifiesOnP
     public static String getProcessName() {
-        // Once we drop support JB, this method can be simplified to not cache sProcessName and call
-        // ActivityThread.currentProcessName().
-        if (sProcessName != null) {
-            return sProcessName;
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
+            return Application.getProcessName();
         }
         try {
-            // An even more convenient ActivityThread.currentProcessName() exists, but was not added
-            // until JB MR2.
             Class<?> activityThreadClazz = Class.forName("android.app.ActivityThread");
-            Object activityThread =
-                    activityThreadClazz.getMethod("currentActivityThread").invoke(null);
-            // Before JB MR2, currentActivityThread() returns null when called on a non-UI thread.
-            // Cache the name to allow other threads to access it.
-            sProcessName =
-                    (String) activityThreadClazz.getMethod("getProcessName").invoke(activityThread);
-            return sProcessName;
-        } catch (Exception e) { // No multi-catch below API level 19 for reflection exceptions.
+            return (String) activityThreadClazz.getMethod("currentProcessName").invoke(null);
+        } catch (Exception e) {
             // If fallback logic is ever needed, refer to:
             // https://chromium-review.googlesource.com/c/chromium/src/+/905563/1
             throw new RuntimeException(e);