Revert "Fixed compiler warning C4267 'conversion from 'size_t' to 'type', possible loss of data'"

Seems to have quite a few warnings in 64-bit on my machine.

BUG=angleproject:1120

This reverts commit c5cf9bc47d0ee028adbbf9e9f94ca567eec601dc.

Change-Id: I86768b900aeba52e7a2242d9ae8949f93f1a5ba9
Reviewed-on: https://chromium-review.googlesource.com/293280
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>
diff --git a/src/compiler/translator/Compiler.cpp b/src/compiler/translator/Compiler.cpp
index 3e9a0b6..396b390 100644
--- a/src/compiler/translator/Compiler.cpp
+++ b/src/compiler/translator/Compiler.cpp
@@ -544,7 +544,7 @@
             infoSink.info << "Call stack too deep (larger than " << maxCallStackDepth
                           << ") with the following call chain: " << record.name;
 
-            int currentFunction = static_cast<int>(i);
+            int currentFunction = i;
             int currentDepth = depth;
 
             while (currentFunction != -1)
@@ -574,7 +574,7 @@
 bool TCompiler::tagUsedFunctions()
 {
     // Search from main, starting from the end of the DAG as it usually is the root.
-    for (size_t i = mCallDag.size(); i-- > 0;)
+    for (int i = mCallDag.size(); i-- > 0;)
     {
         if (mCallDag.getRecordFromIndex(i).name == "main(")
         {