Only call finishLoad() if session actually loaded.

Source/modules/encryptedmedia/MediaKeySession.cpp

Index: Source/modules/encryptedmedia/MediaKeySession.cpp
diff --git a/Source/modules/encryptedmedia/MediaKeySession.cpp b/Source/modules/encryptedmedia/MediaKeySession.cpp
index fe6455f2c34928282cec98e2953e0d8fd265ae8e..5643743136fdb46a7b18b30371543d0a6f33856a 100644
--- a/Source/modules/encryptedmedia/MediaKeySession.cpp
+++ b/Source/modules/encryptedmedia/MediaKeySession.cpp
@@ -271,15 +271,15 @@ public:
     // ContentDecryptionModuleResult implementation.
     virtual void completeWithSession(WebContentDecryptionModuleResult::SessionStatus status) override
     {
-        bool result = false;
         switch (status) {
         case WebContentDecryptionModuleResult::NewSession:
-            result = true;
-            break;
+            m_session->finishLoad();
+            resolve(true);
+            return;
 
         case WebContentDecryptionModuleResult::SessionNotFound:
-            result = false;
-            break;
+            resolve(false);
+            return;
 
         case WebContentDecryptionModuleResult::SessionAlreadyExists:
             ASSERT_NOT_REACHED();
@@ -287,8 +287,7 @@ public:
             return;
         }
 
-        m_session->finishLoad();
-        resolve(result);
+        ASSERT_NOT_REACHED();
     }
 
     DEFINE_INLINE_TRACE()