Fix typo: imcompatible -> incompatible

BUG=429053
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2353443002
Cr-Commit-Position: refs/heads/master@{#419616}

gpu/command_buffer/service/gles2_cmd_decoder.cc

@@ -13175,7 +13175,7 @@ bool GLES2DecoderImpl::ValidateCopyTexFormat(
           (da > 0 && sa != da)) {
         LOCAL_SET_GL_ERROR(
             GL_INVALID_OPERATION,
-            func_name, "imcompatible color component sizes");
+            func_name, "incompatible color component sizes");
         return false;
       }
     }