Early exit from handlePreNativeStartup if activity is finishing

If the activity is finishing or being destroyed, exit from
ChromeBrowserInitializer#handlePreNativeStartup before firing pre-native
and pre-inflation startup calls.

BUG=1059447

Change-Id: Ia907da1c39321b97cf3405b358831b71e0add482
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2100110
Commit-Queue: Theresa  <twellington@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749733}

chrome/android/java/src/org/chromium/chrome/browser/init/ChromeBrowserInitializer.java

@@ -153,6 +153,7 @@ public class ChromeBrowserInitializer {
      */
     public void handlePreNativeStartup(final BrowserParts parts) {
         ThreadUtils.checkUiThread();
+        if (parts.isActivityFinishingOrDestroyed()) return;
         ProcessInitializationHandler.getInstance().initializePreNative();
         try (TraceEvent e = TraceEvent.scoped("ChromeBrowserInitializer.preInflationStartup")) {
             preInflationStartup();