Fix a 64-bit error in ProgramBinary::load

ProgramBinary::save writes a size_t, so ProgramBinary::load needs
to read it as the same type.

Landed for jschuh.
Original review: https://codereview.appspot.com/7304057/
Review URL: https://codereview.appspot.com/7310052

git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1959 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/libGLESv2/ProgramBinary.cpp b/src/libGLESv2/ProgramBinary.cpp
index eda0e5c..0143b66 100644
--- a/src/libGLESv2/ProgramBinary.cpp
+++ b/src/libGLESv2/ProgramBinary.cpp
@@ -1618,7 +1618,7 @@
     stream.read(&mUsedPixelSamplerRange);
     stream.read(&mUsesPointSize);
 
-    unsigned int size;
+    size_t size;
     stream.read(&size);
     if (stream.error())
     {