aura: Clean up compositor initialization/destruction.

chrome/test/ppapi/ppapi_test.cc

Index: chrome/test/ppapi/ppapi_test.cc
diff --git a/chrome/test/ppapi/ppapi_test.cc b/chrome/test/ppapi/ppapi_test.cc
index 5973877c440e2bad343ddafb4d774ee13f309149..6054c45d06c748a5dc14dc3565bef5b0a77d4d8a 100644
--- a/chrome/test/ppapi/ppapi_test.cc
+++ b/chrome/test/ppapi/ppapi_test.cc
@@ -22,7 +22,6 @@
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
-#include "chrome/test/base/test_launcher_utils.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/dom_operation_notification_details.h"
 #include "content/public/browser/notification_service.h"
@@ -117,15 +116,6 @@ PPAPITestBase::PPAPITestBase() {
 }
 
 void PPAPITestBase::SetUpCommandLine(CommandLine* command_line) {
-  // Do not use mesa if real GPU is required.
-  if (!command_line->HasSwitch(switches::kUseGpuInTests)) {
-#if !defined(OS_MACOSX)
-    CHECK(test_launcher_utils::OverrideGLImplementation(
-        command_line, gfx::kGLImplementationOSMesaName)) <<
-        "kUseGL must not be set by test framework code!";
-#endif
-  }
-
   // The test sends us the result via a cookie.
   command_line->AppendSwitch(switches::kEnableFileCookies);