Do not record log split time when handling separator

Previously handleSeparator() caused the ResearchLogger to mark the time at which a LogUnit should be
broken.  However, this causes the motion data associated with a separator to be associated with the
LogUnit of the previous word.  This change corrects this bug.

Change-Id: I8b4d4fa6de2a013de9e2a28bb668c446a07f1957
diff --git a/java/src/com/android/inputmethod/latin/LatinIME.java b/java/src/com/android/inputmethod/latin/LatinIME.java
index 92b68dc..4a0af27 100644
--- a/java/src/com/android/inputmethod/latin/LatinIME.java
+++ b/java/src/com/android/inputmethod/latin/LatinIME.java
@@ -1905,7 +1905,6 @@
     private boolean handleSeparator(final int primaryCode, final int x, final int y,
             final int spaceState) {
         if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-            ResearchLogger.recordTimeForLogUnitSplit();
             ResearchLogger.latinIME_handleSeparator(primaryCode, mWordComposer.isComposingWord());
         }
         boolean didAutoCorrect = false;