Change the ENVIRONMENT_MAJOR_VERSION to "1"

----Release Notes----
[]
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=89562565
diff --git a/sdk/src/main/java/com/google/cloud/dataflow/sdk/runners/DataflowPipelineRunner.java b/sdk/src/main/java/com/google/cloud/dataflow/sdk/runners/DataflowPipelineRunner.java
index 67d5df0..4283614 100644
--- a/sdk/src/main/java/com/google/cloud/dataflow/sdk/runners/DataflowPipelineRunner.java
+++ b/sdk/src/main/java/com/google/cloud/dataflow/sdk/runners/DataflowPipelineRunner.java
@@ -80,7 +80,7 @@
   private DataflowPipelineRunnerHooks hooks;
 
   // Environment version information
-  private static final String ENVIRONMENT_MAJOR_VERSION = "2";
+  private static final String ENVIRONMENT_MAJOR_VERSION = "1";
 
   /**
    * Construct a runner from the provided options.