Revert "Adds TUnorderedMap and uses it for tLevel in TSymbolTableLevel."

This reverts commit c14348a2589e5d995f63019433175545ba90040b.

Reason for revert: crashes in murmurhash on Nexus 6
See https://build.chromium.org/p/chromium.gpu.fyi/builders/Android%20Release%20%28Nexus%206%29/builds/7865

Original change's description:
> Adds TUnorderedMap and uses it for tLevel in TSymbolTableLevel.
> 
> Change-Id: I27ba7a41c599ef6f7fe68b22c27bd2a40175ddf9
> Reviewed-on: https://chromium-review.googlesource.com/526672
> Commit-Queue: Jamie Madill <jmadill@chromium.org>
> Reviewed-by: Jamie Madill <jmadill@chromium.org>

TBR=jmadill@chromium.org,kbr@chromium.org,bajones@chromium.org,kainino@chromium.org,lethalantidote@chromium.org

Change-Id: Id4a428430c6d286b910790ba7c30503c98ce728f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/551235
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
diff --git a/src/compiler/translator/SymbolTable.h b/src/compiler/translator/SymbolTable.h
index 33abdf4..48c2dfe 100644
--- a/src/compiler/translator/SymbolTable.h
+++ b/src/compiler/translator/SymbolTable.h
@@ -232,7 +232,7 @@
 class TSymbolTableLevel
 {
   public:
-    typedef TUnorderedMap<TString, TSymbol *> tLevel;
+    typedef TMap<TString, TSymbol *> tLevel;
     typedef tLevel::const_iterator const_iterator;
     typedef const tLevel::value_type tLevelPair;
     typedef std::pair<tLevel::iterator, bool> tInsertResult;