Revert "Fix and enable warning C4244 (Conversion from 'type1' to 'type2', possible loss of data)"

Causing a build failure on Mac/Clang:

./Tokenizer.cpp:551:7: error: extra tokens at end of #else directive [-Werror,-Wextra-tokens]
#else if defined(_MSC_VER)

http://build.chromium.org/p/chromium.gpu.fyi/builders/GPU%20Mac%20Builder/builds/29136

This reverts commit 3b26e231d99154814eb428f75a67bbe7a21adadc.

Change-Id: I2d11ddcc18130d908fd2ec3d6f5ab890cfccd5e7
Reviewed-on: https://chromium-review.googlesource.com/264983
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>
diff --git a/src/compiler/translator/InitializeVariables.cpp b/src/compiler/translator/InitializeVariables.cpp
index 2bb609a..0e3e2eb 100644
--- a/src/compiler/translator/InitializeVariables.cpp
+++ b/src/compiler/translator/InitializeVariables.cpp
@@ -13,7 +13,7 @@
 TIntermConstantUnion *constructFloatConstUnionNode(const TType &type)
 {
     TType myType = type;
-    unsigned char size = static_cast<unsigned char>(myType.getNominalSize());
+    unsigned char size = myType.getNominalSize();
     if (myType.isMatrix())
         size *= size;
     ConstantUnion *u = new ConstantUnion[size];