Disable *.TrueTypeFont browser_test for Ozone CrOS.

These tests are already disabled in content_browsertests for Ozone CrOS.
They aren't disabled in browser_tests, probably because it's not run as
part of CQ.

The implementation of TrueType font information is missing for Ozone
because pango isn't compiled. This is probably the reason why the tests
fail.

BUG=619765

Review-Url: https://codereview.chromium.org/2856963002
Cr-Commit-Position: refs/heads/master@{#468961}

chrome/test/ppapi/ppapi_browsertest.cc

@@ -1181,7 +1181,13 @@ TEST_PPAPI_NACL(MouseCursor)
 
 TEST_PPAPI_NACL(NetworkProxy)
 
-TEST_PPAPI_NACL(TrueTypeFont)
+// TODO(crbug.com/619765): get working on CrOS ozone build.
+#if defined(OS_CHROMEOS) && defined(USE_OZONE)
+#define MAYBE_TrueTypeFont DISABLED_TrueTypeFont
+#else
+#define MAYBE_TrueTypeFont TrueTypeFont
+#endif
+TEST_PPAPI_NACL(MAYBE_TrueTypeFont)
 
 // TODO(crbug.com/602875), TODO(crbug.com/602876) Flaky on Win and CrOS.
 #if defined(OS_CHROMEOS) || defined(OS_WIN)