media: Always define |cdm_id| in CdmContext.

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 5e546a8416fcc777d6eb88daac08bf8c8f3df116..39e39140b7f022175614c3d4b21590ea1b50b012 100644
--- a/media/test/pipeline_integration_test.cc
+++ b/media/test/pipeline_integration_test.cc
@@ -219,10 +219,7 @@ class FakeEncryptedMedia {
     TestCdmContext(Decryptor* decryptor) : decryptor_(decryptor) {}
 
     Decryptor* GetDecryptor() final { return decryptor_; }
-
-#if defined(ENABLE_BROWSER_CDMS)
     int GetCdmId() const final { return kInvalidCdmId; }
-#endif
 
    private:
     Decryptor* decryptor_;