Remove unused streamOffset from IndexRangeCache

This value is now redundant - it is always the same as regular offset.

TEST=angle_end2end_tests
BUG=angleproject:956

Change-Id: If4b6c8bcbebf24fbf84723fe081fd058916cc504
Reviewed-on: https://chromium-review.googlesource.com/262423
Reviewed-by: Nicolas Capens <capn@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Olli Etuaho <oetuaho@nvidia.com>
diff --git a/src/libANGLE/validationES.cpp b/src/libANGLE/validationES.cpp
index fa741b0..6469510 100644
--- a/src/libANGLE/validationES.cpp
+++ b/src/libANGLE/validationES.cpp
@@ -1599,7 +1599,7 @@
     if (elementArrayBuffer)
     {
         uintptr_t offset = reinterpret_cast<uintptr_t>(indices);
-        if (!elementArrayBuffer->getIndexRangeCache()->findRange(type, offset, count, indexRangeOut, NULL))
+        if (!elementArrayBuffer->getIndexRangeCache()->findRange(type, offset, count, indexRangeOut))
         {
             rx::BufferImpl *bufferImpl = elementArrayBuffer->getImplementation();
             const uint8_t *dataPointer = NULL;
@@ -1612,7 +1612,7 @@
 
             const uint8_t *offsetPointer = dataPointer + offset;
             *indexRangeOut = rx::IndexRangeCache::ComputeRange(type, offsetPointer, count);
-            elementArrayBuffer->getIndexRangeCache()->addRange(type, offset, count, *indexRangeOut, offset);
+            elementArrayBuffer->getIndexRangeCache()->addRange(type, offset, count, *indexRangeOut);
         }
     }
     else