Use a raw pointer instead of Singleton for PnaclHost and leak it.

components/nacl/browser/pnacl_host_unittest.cc

Index: components/nacl/browser/pnacl_host_unittest.cc
diff --git a/components/nacl/browser/pnacl_host_unittest.cc b/components/nacl/browser/pnacl_host_unittest.cc
index 39bd6d4257de52912e0e61107915a3e82fbf8f61..37cdadbd85887d7323b5f5a4e600ad563d6a3a3a 100644
--- a/components/nacl/browser/pnacl_host_unittest.cc
+++ b/components/nacl/browser/pnacl_host_unittest.cc
@@ -41,7 +41,7 @@ class PnaclHostTest : public testing::Test {
         write_callback_count_(0),
         thread_bundle_(content::TestBrowserThreadBundle::IO_MAINLOOP) {}
   void SetUp() override {
-    host_ = new PnaclHost();
+    host_ = PnaclHost::GetInstance();
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     host_->InitForTest(temp_dir_.path(), true);
     base::RunLoop().RunUntilIdle();
@@ -53,7 +53,6 @@ class PnaclHostTest : public testing::Test {
     host_->RendererClosing(0);
     content::RunAllBlockingPoolTasksUntilIdle();
     EXPECT_EQ(PnaclHost::CacheUninitialized, host_->cache_state_);
-    delete host_;
   }
   int GetCacheSize() { return host_->disk_cache_->Size(); }
   int CacheIsInitialized() {
@@ -441,7 +440,7 @@ TEST_F(PnaclHostTest, ClearTranslationCache) {
 class PnaclHostTestDisk : public PnaclHostTest {
  protected:
   void SetUp() override {
-    host_ = new PnaclHost();
+    host_ = PnaclHost::GetInstance();
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     host_->InitForTest(temp_dir_.path(), false);
     EXPECT_EQ(PnaclHost::CacheInitializing, host_->cache_state_);