Fix typo from commit a9d4bc5. (Autocomplete fail)

TBR=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1345883003 .
diff --git a/fpdfsdk/src/fpdfdoc_embeddertest.cpp b/fpdfsdk/src/fpdfdoc_embeddertest.cpp
index 553e900..8b1c4fb 100644
--- a/fpdfsdk/src/fpdfdoc_embeddertest.cpp
+++ b/fpdfsdk/src/fpdfdoc_embeddertest.cpp
@@ -50,7 +50,7 @@
   ASSERT_TRUE(action);
 
   const char kExpectedResult[] = "test.pdf";
-  const unsigned long kExpectedLength = sizeof(kExpectedLength);
+  const unsigned long kExpectedLength = sizeof(kExpectedResult);
   unsigned long bufsize = FPDFAction_GetFilePath(action, nullptr, 0);
   ASSERT_EQ(kExpectedLength, bufsize);