Increase timeout in FeedContentStorageConformanceTest.

Seeing if that will address this sort of crash:

Not true that <null> is equal to <com.google.android.libraries.feed.host.storage.CommitResult@422779e0>
	at com.google.android.libraries.feed.testing.conformance.storage.ContentStorageConformanceTest.lambda$new$8$ContentStorageConformanceTest(ContentStorageConformanceTest.java:110)
	at com.google.android.libraries.feed.testing.conformance.storage.ContentStorageConformanceTest$$Lambda$8.accept(Unknown Source)
	at com.google.android.libraries.feed.common.testing.RequiredConsumer.accept(RequiredConsumer.java:32)
	at org.chromium.chrome.browser.feed.ConsumerSyncWrapper.blockAndWrappedAccept(ConsumerSyncWrapper.java:36)
	at org.chromium.chrome.browser.feed.ConsumerSyncWrapper.waitForConsumer(ConsumerSyncWrapper.java:56)
	at org.chromium.chrome.browser.feed.FeedContentStorageConformanceTest$ContentStorageWrapper.commit(FeedContentStorageConformanceTest.java:67)
	at com.google.android.libraries.feed.testing.conformance.storage.ContentStorageConformanceTest.storeAndDeleteAll(ContentStorageConformanceTest.java:258)

See:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/KitKat%20Tablet%20Tester/20063

TBR=aluo@chromium.org,skym@chromium.org
BUG=

Change-Id: Ic4811ae94f2db270b7717ce04b7ff9a1fc18811e
Reviewed-on: https://chromium-review.googlesource.com/c/1355335Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Sky Malice <skym@chromium.org>
Commit-Queue: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612243}

chrome/android/javatests/src/org/chromium/chrome/browser/feed/FeedContentStorageConformanceTest.java

@@ -37,7 +37,7 @@ import java.util.Map;
 @SmallTest
 @RunWith(ChromeJUnit4ClassRunner.class)
 public final class FeedContentStorageConformanceTest extends ContentStorageConformanceTest {
-    private static final long TIMEOUT = scaleTimeout(1000);
+    private static final long TIMEOUT = scaleTimeout(3000);
 
     class ContentStorageWrapper extends FeedContentStorage {
         public ContentStorageWrapper(Profile p) {