Add AwVariationsSeedFetcher and refactory VariationsSeedFetcher

components/variations/android/junit/src/org/chromium/components/variations/firstrun/VariationsSeedFetcherTest.java

Index: components/variations/android/junit/src/org/chromium/components/variations/firstrun/VariationsSeedFetcherTest.java
diff --git a/components/variations/android/junit/src/org/chromium/components/variations/firstrun/VariationsSeedFetcherTest.java b/components/variations/android/junit/src/org/chromium/components/variations/firstrun/VariationsSeedFetcherTest.java
index 5415c9fa1d9d7040a185673c17a57aff8fd07f8f..a4a426e67643a0206f172dddea7ee30e18579fa7 100644
--- a/components/variations/android/junit/src/org/chromium/components/variations/firstrun/VariationsSeedFetcherTest.java
+++ b/components/variations/android/junit/src/org/chromium/components/variations/firstrun/VariationsSeedFetcherTest.java
@@ -53,7 +53,11 @@ public class VariationsSeedFetcherTest {
         ThreadUtils.setUiThread(mock(Looper.class));
         mFetcher = spy(VariationsSeedFetcher.get());
         mConnection = mock(HttpURLConnection.class);
-        doReturn(mConnection).when(mFetcher).getServerConnection("");
+        doReturn(mConnection)
+                .when(mFetcher)
+                .getServerConnection(VariationsSeedFetcher.VARIATIONS_SERVER_URL
+                                + VariationsSeedFetcher.VARIATIONS_PLATFORM,

[Alexei Svitkine (slow), 2017/07/06 22:01:10]

It's not great to leak the details of how to construct the URL outside of the
class. How about having the function just take the platform name as a parameter
and construct the full URL itself?

+                        "");
         mPrefs = ContextUtils.getAppSharedPreferences();
         mPrefs.edit().clear().apply();
     }