[Android] Reduce visibility of Tab#getTabObservers.

chrome/android/javatests/src/org/chromium/chrome/browser/toolbar/BrandColorTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/toolbar/BrandColorTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/toolbar/BrandColorTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/toolbar/BrandColorTest.java
index a745edd0827d5c75be79791d5801b9a6145e1b5a..a637194d4b46de91cfadfd67fca2955a56970755 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/toolbar/BrandColorTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/toolbar/BrandColorTest.java
@@ -22,6 +22,7 @@ import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeActivity;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tab.TabObserver;
+import org.chromium.chrome.browser.tab.TabTestUtils;
 import org.chromium.chrome.browser.util.ColorUtils;
 import org.chromium.chrome.test.ChromeActivityTestCaseBase;
 import org.chromium.chrome.test.util.ChromeRestriction;
@@ -173,7 +174,7 @@ public class BrandColorTest extends ChromeActivityTestCaseBase<ChromeActivity> {
             @Override
             public void run() {
                 Tab tab = getActivity().getActivityTab();
-                RewindableIterator<TabObserver> observers = tab.getTabObservers();
+                RewindableIterator<TabObserver> observers = TabTestUtils.getTabObservers(tab);
                 while (observers.hasNext()) {
                     observers.next().onLoadStarted(tab, true);
                 }