Fix overloaded pipeline integration tests to support underflow.

media/test/pipeline_integration_test.cc

Index: media/test/pipeline_integration_test.cc
diff --git a/media/test/pipeline_integration_test.cc b/media/test/pipeline_integration_test.cc
index 78ebfe053dde6cb089d68c5a68193a5562a6b024..dcbb66db8b2be06d7f04796382b499131f20d802 100644
--- a/media/test/pipeline_integration_test.cc
+++ b/media/test/pipeline_integration_test.cc
@@ -663,7 +663,9 @@ class PipelineIntegrationTest : public PipelineIntegrationTestHost {
         .Times(AtMost(1))
         .WillRepeatedly(SaveArg<0>(&metadata_));
     EXPECT_CALL(*this, OnBufferingStateChanged(BUFFERING_HAVE_ENOUGH))
-        .Times(AtMost(1));
+        .Times(AnyNumber());
+    EXPECT_CALL(*this, OnBufferingStateChanged(BUFFERING_HAVE_NOTHING))
+        .Times(AnyNumber());
 
     // Encrypted content not used, so this is never called.
     EXPECT_CALL(*this, OnWaitingForDecryptionKey()).Times(0);
@@ -700,7 +702,9 @@ class PipelineIntegrationTest : public PipelineIntegrationTestHost {
         .Times(AtMost(1))
         .WillRepeatedly(SaveArg<0>(&metadata_));
     EXPECT_CALL(*this, OnBufferingStateChanged(BUFFERING_HAVE_ENOUGH))
-        .Times(AtMost(1));
+        .Times(AnyNumber());
+    EXPECT_CALL(*this, OnBufferingStateChanged(BUFFERING_HAVE_NOTHING))
+        .Times(AnyNumber());
     EXPECT_CALL(*this, DecryptorAttached(true));
 
     // Encrypted content used but keys provided in advance, so this is