Merge to XFA: Take care fall-through cases of switch in pdfium

Found with Clang's -Wimplicit-fallthrough option by tzik@chromium.org.

TBR=tzik@chromium.org

Review URL: https://codereview.chromium.org/1549283002 .

(cherry picked from commit de0387c3690ca147482ed943c70eeb828b6dd732)

Review URL: https://codereview.chromium.org/1554453002 .
diff --git a/fpdfsdk/src/javascript/JS_GlobalData.cpp b/fpdfsdk/src/javascript/JS_GlobalData.cpp
index 474886c..4d6edc8 100644
--- a/fpdfsdk/src/javascript/JS_GlobalData.cpp
+++ b/fpdfsdk/src/javascript/JS_GlobalData.cpp
@@ -51,13 +51,13 @@
         pNewObjData->nType = pOldObjData->nType;
         pNewObjData->objData.Copy(pOldObjData->objData);
         Add(pNewObjData);
-      }
+      } break;
       case JS_GLOBALDATA_TYPE_NULL: {
         CJS_KeyValue* pNewObjData = new CJS_KeyValue;
         pNewObjData->sKey = pOldObjData->sKey;
         pNewObjData->nType = pOldObjData->nType;
         Add(pNewObjData);
-      }
+      } break;
     }
   }
 }