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/libANGLE/renderer/gl/VertexArrayGL.cpp b/src/libANGLE/renderer/gl/VertexArrayGL.cpp
index 9e7cce8..352f292 100644
--- a/src/libANGLE/renderer/gl/VertexArrayGL.cpp
+++ b/src/libANGLE/renderer/gl/VertexArrayGL.cpp
@@ -364,10 +364,9 @@
                 // Compute where the 0-index vertex would be.
                 const size_t vertexStartOffset = curBufferOffset - (indexRange.start * destStride);
 
-                mFunctions->vertexAttribPointer(
-                    idx, attrib.size, attrib.type, attrib.normalized,
-                    static_cast<GLsizei>(destStride),
-                    reinterpret_cast<const GLvoid *>(vertexStartOffset));
+                mFunctions->vertexAttribPointer(idx, attrib.size, attrib.type,
+                                                attrib.normalized, destStride,
+                                                reinterpret_cast<const GLvoid*>(vertexStartOffset));
 
                 curBufferOffset += destStride * streamedVertexCount;