Remove an unnecessary and non-compliant format check from the SubImage family of calls.

src/libGLESv2/Texture.cpp

@@ -271,6 +271,8 @@ GLenum Texture::getUsage() const
 
 void Texture::setImage(GLint unpackAlignment, GLenum type, const void *pixels, rx::Image *image)
 {
+    // We no longer need the "GLenum format" parameter to TexImage to determine what data format "pixels" contains.
+    // From our image internal format we know how many channels to expect, and "type" gives the format of pixel's components.
     if (pixels != NULL)
     {
         image->loadData(0, 0, 0, image->getWidth(), image->getHeight(), image->getDepth(), unpackAlignment, type, pixels);

src/libGLESv2/validationES3.cpp

@@ -246,15 +246,6 @@ bool ValidateES3TexImageParameters(gl::Context *context, GLenum target, GLint le
             return gl::error(GL_INVALID_OPERATION, false);
         }
 
-        if (format != GL_NONE)
-        {
-            GLenum internalformat = gl::GetSizedInternalFormat(format, type, context->getClientVersion());
-            if (internalformat != textureInternalFormat)
-            {
-                return gl::error(GL_INVALID_OPERATION, false);
-            }
-        }
-
         if (isCompressed)
         {
             if ((width % 4 != 0 && width != textureLevelWidth) ||