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

Change-Id: I73d9a2b9ad16f032be974b9c819de0dc1247c2ea
Reviewed-on: https://chromium-review.googlesource.com/264533
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>
diff --git a/src/tests/end2end_tests/LineLoopTest.cpp b/src/tests/end2end_tests/LineLoopTest.cpp
index 6f9217c..e6c4a73 100644
--- a/src/tests/end2end_tests/LineLoopTest.cpp
+++ b/src/tests/end2end_tests/LineLoopTest.cpp
@@ -69,7 +69,7 @@
         ANGLETest::TearDown();
     }
 
-    void runTest(GLenum indexType, GLubyte indexBuffer, const GLvoid *indexPtr)
+    void runTest(GLenum indexType, GLuint indexBuffer, const GLvoid *indexPtr)
     {
         static const GLfloat loopPositions[] =
         {