Made sync code build and pass unit tests on OS X.

chrome/test/browser_with_test_window_test.cc

Index: chrome/test/browser_with_test_window_test.cc
diff --git a/chrome/test/browser_with_test_window_test.cc b/chrome/test/browser_with_test_window_test.cc
index 3e3fb93a8f6153bfe8e121641454be4f9ccf9de1..8dede7cbe3cd91c1cd2532045418213b4ee9354e 100644
--- a/chrome/test/browser_with_test_window_test.cc
+++ b/chrome/test/browser_with_test_window_test.cc
@@ -12,7 +12,9 @@
 BrowserWithTestWindowTest::BrowserWithTestWindowTest()
     : rph_factory_(),
       rvh_factory_(&rph_factory_) {
+#if defined(OS_WIN)
   OleInitialize(NULL);
+#endif
 }
 
 void BrowserWithTestWindowTest::SetUp() {
@@ -38,7 +40,9 @@ BrowserWithTestWindowTest::~BrowserWithTestWindowTest() {
   MessageLoop::current()->PostTask(FROM_HERE, new MessageLoop::QuitTask);
   MessageLoop::current()->Run();
 
+#if defined(OS_WIN)
   OleUninitialize();
+#endif
 }
 
 TestRenderViewHost* BrowserWithTestWindowTest::TestRenderViewHostForTab(