Disable CrashDumpManagerTest#testUploadMinidump_NoCallback (flaky).

TBR=gsennton@chromium.org,isherman@chromium.org

Bug: 725379
Change-Id: I20682c13346285b427b94f04300eb2056f0b5835
Reviewed-on: https://chromium-review.googlesource.com/517003Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Commit-Queue: Matt Giuca <mgiuca@chromium.org>
Cr-Commit-Position: refs/heads/master@{#474957}

components/crash/android/javatests/src/org/chromium/components/crash/browser/CrashDumpManagerTest.java

@@ -44,6 +44,7 @@ public class CrashDumpManagerTest extends InstrumentationTestCase {
 
     @SmallTest
     @Feature({"Android-AppBase"})
+    @DisabledTest // Flaky, crbug.com/725379.
     public void testUploadMinidump_NoCallback() throws IOException {
         File minidump = new File(mTempDir, "mini.dmp");
         assertTrue(minidump.createNewFile());