A significant number of downstream bots are failing compile for CustomTabsConnectionTest.

https://uberchromegw.corp.google.com/i/official.android/builders/official-arm/builds/853

https://uberchromegw.corp.google.com/i/official.android/builders/official-x86/builds/851

https://uberchromegw.corp.google.com/i/official.android/builders/official-x86_64/builds/850

Adding a snippet from the log error.

../../chrome/android/javatests/src/org/chromium/chrome/browser/customtabs/CustomTabsConnectionTest.java:466: error: cannot find symbol
        final CustomTabsSessionToken token =
              ^
  symbol:   class CustomTabsSessionToken
  location: class CustomTabsConnectionTest
../../chrome/android/javatests/src/org/chromium/chrome/browser/customtabs/CustomTabsConnectionTest.java:467: error: cannot find symbol
                CustomTabsSessionToken.createDummySessionTokenForTesting();
                ^
  symbol:   variable CustomTabsSessionToken
  location: class CustomTabsConnectionTest
../../chrome/android/javatests/src/org/chromium/chrome/browser/customtabs/CustomTabsConnectionTest.java:485: error: cannot find symbol
        final CustomTabsSessionToken token =
              ^
  symbol:   class CustomTabsSessionToken
  location: class CustomTabsConnectionTest
../../chrome/android/javatests/src/org/chromium/chrome/browser/customtabs/CustomTabsConnectionTest.java:486: error: cannot find symbol
                CustomTabsSessionToken.createDummySessionTokenForTesting();
                ^
  symbol:   variable CustomTabsSessionToken
  location: class CustomTabsConnectionTest
../../chrome/android/javatests/src/org/chromium/chrome/browser/customtabs/CustomTabsConnectionTest.java:507: error: cannot find symbol
        CustomTabsSessionToken token = CustomTabsSessionToken.createDummySessionTokenForTesting();
        ^
  symbol:   class CustomTabsSessionToken
  location: class CustomTabsConnectionTest
../../chrome/android/javatests/src/org/chromium/chrome/browser/customtabs/CustomTabsConnectionTest.java:507: error: cannot find symbol
        CustomTabsSessionToken token = CustomTabsSessionToken.createDummySessionTokenForTesting();
                                       ^
  symbol:   variable CustomTabsSessionToken
  location: class CustomTabsConnectionTest
6 errors

lizeb@, could you take a look?