[milo] build_source -> buildSource.

milo/buildsource/swarming/buildLog_test.go

 package swarming
 
 import (
         "context"
         "strings"
         "testing"
 
         "github.com/luci/gae/impl/memory"
         "github.com/luci/luci-go/common/clock/testclock"
 
@@ skipping 14 matching lines @@
         c = memory.UseWithAppID(c, "dev~luci-milo")
         Convey(`Build log tests`, t, func() {
                 _, _, err := swarmingBuildLogImpl(c, testSvc, "12340", "/update_scripts/0/stdout")
                 So(err, ShouldBeNil)
         })
         Convey(`List available streams`, t, func() {
                 _, _, err := swarmingBuildLogImpl(c, testSvc, "12340", "/notexist")
                 So(strings.HasPrefix(err.Error(), "stream \"steps/notexist\" not found"), ShouldEqual, true)
         })
 }