[Android] Cleanup ExternalNavigationHandlerTest

This CL:
- Replaces calls to
  ExternalNavigationDelegateImpl#isSpecializedHandlerAvailable() with calls to
  #countSpecializedHandlers() because #isSpecializedHandlerAvailable() has just
  one caller
- Replaces ChromeBrowserTestRule with NativeLibraryTestRule
- Uses a mock context for both ContextUtils#getApplicationContext() and for
  TabRedirectHandler instead of just for TabRedirectHandler
- Makes TestPackageManager#queryIntentActivities() and
  TestExternalNavigationDelegate#queryIntentActivities() use same
  implementation.
- Changes tests to register relevant http:// and https:// handlers at the
  beginning of the test. This is a change of behavior. Previously, most URLs
  would be handled by the "foo" external app
- Changes TestExternalNavigationDelegate#mQueryIntentOverride from tristate to
  boolean. The "true behavior" was nuked but the "false behavior" was
  preserved.

BUG=None

Change-Id: If212afde6e4c12d4f08576c4bd26392b8732bc09
Reviewed-on: https://chromium-review.googlesource.com/891744
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Maria Khomenko <mariakhomenko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532970}

chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegate.java

@@ -29,12 +29,6 @@ interface ExternalNavigationDelegate {
      */
     boolean willChromeHandleIntent(Intent intent);
 
-    /**
-     * Search for intent handlers that are specific to this URL aka, specialized apps like
-     * google maps or youtube
-     */
-    boolean isSpecializedHandlerAvailable(List<ResolveInfo> infos);
-
     /**
      * Returns true if the current activity is a webapp and {@params url} lies within the scope of
      * that webapp.

chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegateImpl.java

@@ -253,11 +253,6 @@ public class ExternalNavigationDelegateImpl implements ExternalNavigationDelegat
         return willChromeHandleIntent(intent, false);
     }
 
-    @Override
-    public boolean isSpecializedHandlerAvailable(List<ResolveInfo> infos) {
-        return countSpecializedHandlers(infos) > 0;
-    }
-
     @Override
     public boolean isWithinCurrentWebappScope(String url) {
         Context context = getAvailableContext();

chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationHandler.java

@@ -419,7 +419,7 @@ public class ExternalNavigationHandler {
         // handlers. If webkit can't handle it internally, we need to call
         // startActivityIfNeeded or startActivity.
         if (!isExternalProtocol) {
-            if (!mDelegate.isSpecializedHandlerAvailable(resolvingInfos)) {
+            if (mDelegate.countSpecializedHandlers(resolvingInfos) == 0) {
                 if (incomingIntentRedirect && mDelegate.maybeLaunchInstantApp(
                         params.getTab(), params.getUrl(), params.getReferrerUrl(), true)) {
                     if (DEBUG) Log.i(TAG, "OVERRIDE_WITH_EXTERNAL_INTENT: Instant Apps redirect");