onnxruntime

e1659122 - upgrade dawn to ec7b457e5bb1fcec6f59733c4f3dd84d2f885a38 (#27427)

upgrade dawn to ec7b457e5bb1fcec6f59733c4f3dd84d2f885a38 (#27427) ### Description Upgrade dawn to latest. This PR includes: - upgrade dawn to ec7b457e5bb1fcec6f59733c4f3dd84d2f885a38 (latest from Chromium DEPS) - remove 2 obsolete patches (dawn_force_enable_f16_nvidia_vulkan.patch, uniform_and_storage_buffer_16_bit_access.patch) that are no longer needed because new dawn uses toggle-based approach - add dawn toggles `vulkan_enable_f16_on_nvidia` and `decompose_uniform_buffers` to replace the removed patches ### Motivation and Context Keep dawn dependency up-to-date with latest Chromium.