Revert "cmd/go: add comment about SIGUSR2 on iOS"

This reverts commit 4f0aac52.

Replaced by a improved strategy later in the CL relation chain.

Change-Id: Iff0333f172443bb5b01a42ad06b01edeb6aa15bc
Reviewed-on: https://go-review.googlesource.com/36068
Run-TryBot: Elias Naur <elias.naur@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>

src/cmd/go/internal/test/test.go

@@ -1561,10 +1561,6 @@ func coverRegisterFile(fileName string, counter []uint32, pos []uint32, numStmts
 
 func main() {
 {{if .IsIOS}}
-	// Send a SIGUSR2, which will be intercepted by LLDB to
-	// tell the test harness that installation was successful,
-	// and to give the exec script a chance set the current
-	// working directory. See misc/ios/go_darwin_arm_exec.go.
 	signal.Notify(make(chan os.Signal), syscall.SIGUSR2)
 	syscall.Kill(0, syscall.SIGUSR2)
 	signal.Reset(syscall.SIGUSR2)