cmd/vendor/github.com/google/pprof: refresh from upstream

Updating to commit dec22b42d9eee442222c36c8da24ddc9905e7ee6
from github.com/google/pprof

Fixes #19322.

Change-Id: I1bc3fcd381f22d52557f61c6fb694f54fc64470c
Reviewed-on: https://go-review.googlesource.com/37652Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/vendor/github.com/google/pprof/internal/driver/fetch_test.go

@@ -74,7 +74,7 @@ func TestSymbolizationPath(t *testing.T) {
 			},
 		}
 		s := &source{}
-		locateBinaries(p, s, obj, &proftest.TestUI{t, tc.msgCount})
+		locateBinaries(p, s, obj, &proftest.TestUI{T: t, Ignore: tc.msgCount})
 		if file := p.Mapping[0].File; file != tc.want {
 			t.Errorf("%s:%s:%s, want %s, got %s", tc.env, tc.file, tc.buildID, tc.want, file)
 		}
@@ -176,7 +176,7 @@ func TestFetch(t *testing.T) {
 		{path + "go.nomappings.crash", "/bin/gotest.exe"},
 		{"http://localhost/profile?file=cppbench.cpu", ""},
 	} {
-		p, _, _, err := grabProfile(&source{ExecName: tc.execName}, tc.source, 0, nil, testObj{}, &proftest.TestUI{t, 0})
+		p, _, _, err := grabProfile(&source{ExecName: tc.execName}, tc.source, 0, nil, testObj{}, &proftest.TestUI{T: t})
 		if err != nil {
 			t.Fatalf("%s: %s", tc.source, err)
 		}

src/cmd/vendor/vendor.json

@@ -9,8 +9,8 @@
 		{
 			"canonical": "github.com/google/pprof",
 			"local": "github.com/google/pprof",
-			"revision": "b1c91b9f8fa7647e4c43c96c50f245df551f7013",
-			"revisionTime": "2017-03-01T17:36:15Z",
+			"revision": "dec22b42d9eee442222c36c8da24ddc9905e7ee6",
+			"revisionTime": "2017-03-01T19:58:13Z",
 		},
 		{
 			"canonical": "golang.org/x/arch/x86/x86asm",