Make the empty browser_test work again after incremental linking broke it.

content/test/test_launcher.cc

Index: content/test/test_launcher.cc
===================================================================
--- content/test/test_launcher.cc	(revision 145643)
+++ content/test/test_launcher.cc	(working copy)
@@ -57,13 +57,6 @@
 
 namespace {
 
-#if defined(IN_PROC_BROWSER_TEST_F)
-// An empty test (it starts up and shuts down the browser as part of its
-// setup and teardown) used to prefetch all of the browser code into memory.
-IN_PROC_BROWSER_TEST_F(InProcessBrowserTest, Empty) {
-}
-#endif
-
 // Parses the environment variable var as an Int32.  If it is unset, returns
 // default_val.  If it is set, unsets it then converts it to Int32 before
 // returning it.  If unsetting or converting to an Int32 fails, print an