Disable slow ProcessSingletonPosixTest tests:

ProcessSingletonPosixTest.NotifyOtherProcessDifferingHost
ProcessSingletonPosixTest.NotifyOtherProcessFailure
ProcessSingletonPosixTest.NotifyOtherProcessOrCreate_DifferingHost

TBR=mattm

BUG=407065

Review URL: https://codereview.chromium.org/504783002

Cr-Commit-Position: refs/heads/master@{#291668}

chrome/browser/process_singleton_posix_unittest.cc

@@ -277,7 +277,8 @@ TEST_F(ProcessSingletonPosixTest, NotifyOtherProcessSuccess) {
 }
 
 // Test failure case of NotifyOtherProcess().
-TEST_F(ProcessSingletonPosixTest, NotifyOtherProcessFailure) {
+// Disabled, http://crbug.com/407065 .
+TEST_F(ProcessSingletonPosixTest, DISABLED_NotifyOtherProcessFailure) {
   CreateProcessSingletonOnThread();
 
   BlockWorkerThread();
@@ -323,7 +324,8 @@ TEST_F(ProcessSingletonPosixTest, NotifyOtherProcessHostChanged) {
 
 // Test that we fail when lock says process is on another host and we can't
 // notify it over the socket.
-TEST_F(ProcessSingletonPosixTest, NotifyOtherProcessDifferingHost) {
+// Disabled, http://crbug.com/407065 .
+TEST_F(ProcessSingletonPosixTest, DISABLED_NotifyOtherProcessDifferingHost) {
   CreateProcessSingletonOnThread();
 
   BlockWorkerThread();
@@ -341,7 +343,9 @@ TEST_F(ProcessSingletonPosixTest, NotifyOtherProcessDifferingHost) {
 
 // Test that we fail when lock says process is on another host and we can't
 // notify it over the socket.
-TEST_F(ProcessSingletonPosixTest, NotifyOtherProcessOrCreate_DifferingHost) {
+// Disabled, http://crbug.com/407065 .
+TEST_F(ProcessSingletonPosixTest,
+       DISABLED_NotifyOtherProcessOrCreate_DifferingHost) {
   CreateProcessSingletonOnThread();
 
   BlockWorkerThread();