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/Common.h b/src/compiler/translator/Common.h
index 96915b6..3e12d2a 100644
--- a/src/compiler/translator/Common.h
+++ b/src/compiler/translator/Common.h
@@ -7,17 +7,15 @@
 #ifndef COMPILER_TRANSLATOR_COMMON_H_
 #define COMPILER_TRANSLATOR_COMMON_H_
 
-#include <stdio.h>
-#include <limits>
 #include <map>
 #include <sstream>
 #include <string>
-#include <unordered_map>
 #include <vector>
+#include <limits>
+#include <stdio.h>
 
 #include "common/angleutils.h"
 #include "common/debug.h"
-#include "common/third_party/murmurhash/MurmurHash3.h"
 #include "compiler/translator/PoolAlloc.h"
 
 namespace sh
@@ -78,23 +76,6 @@
     TVector(size_type i) : std::vector<T, pool_allocator<T>>(i) {}
 };
 
-template <class K, class D, class H = std::hash<K>, class CMP = std::equal_to<K>>
-class TUnorderedMap : public std::unordered_map<K, D, H, CMP, pool_allocator<std::pair<const K, D>>>
-{
-  public:
-    POOL_ALLOCATOR_NEW_DELETE();
-    typedef pool_allocator<std::pair<const K, D>> tAllocator;
-
-    TUnorderedMap() : std::unordered_map<K, D, H, CMP, tAllocator>() {}
-    // use correct two-stage name lookup supported in gcc 3.4 and above
-    TUnorderedMap(const tAllocator &a)
-        : std::unordered_map<K, D, H, CMP, tAllocator>(
-              std::unordered_map<K, D, H, CMP, tAllocator>::key_compare(),
-              a)
-    {
-    }
-};
-
 template <class K, class D, class CMP = std::less<K>>
 class TMap : public std::map<K, D, CMP, pool_allocator<std::pair<const K, D>>>
 {
@@ -123,18 +104,4 @@
 
 }  // namespace sh
 
-namespace std
-{
-template <>
-struct hash<sh::TString>
-{
-    size_t operator()(const sh::TString &s) const
-    {
-        uint32_t result = 0;
-        MurmurHash3_x86_32(s.data(), static_cast<int>(s.length()), 0, &result);
-        return result;
-    }
-};
-}  // namespace std
-
 #endif  // COMPILER_TRANSLATOR_COMMON_H_
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;