Revert of [Sync] Merge sync_unit_tests into components_unit_tests.

tools/valgrind/chrome_tests.py

Index: tools/valgrind/chrome_tests.py
diff --git a/tools/valgrind/chrome_tests.py b/tools/valgrind/chrome_tests.py
index c2d8ad3db14833323f010a1bfc218af368f2a962..458acfd216c5aef99ad2480a93bc3c613ae9873c 100755
--- a/tools/valgrind/chrome_tests.py
+++ b/tools/valgrind/chrome_tests.py
@@ -452,6 +452,9 @@
 
   def TestSql(self):
     return self.SimpleTest("chrome", "sql_unittests")
+
+  def TestSync(self):
+    return self.SimpleTest("chrome", "sync_unit_tests")
 
   def TestLinuxSandbox(self):
     return self.SimpleTest("sandbox", "sandbox_linux_unittests")
@@ -706,6 +709,7 @@
     "sandbox": TestLinuxSandbox, "sandbox_linux_unittests": TestLinuxSandbox,
     "skia": TestSkia,            "skia_unittests": TestSkia,
     "sql": TestSql,              "sql_unittests": TestSql,
+    "sync": TestSync,            "sync_unit_tests": TestSync,
     "sync_integration_tests": TestSyncIntegration,
     "sync_integration": TestSyncIntegration,
     "ui_base_unit": TestUIBaseUnit,       "ui_base_unittests": TestUIBaseUnit,