aura: Clean up compositor initialization/destruction.

chrome/browser/extensions/requirements_checker_browsertest.cc

Index: chrome/browser/extensions/requirements_checker_browsertest.cc
diff --git a/chrome/browser/extensions/requirements_checker_browsertest.cc b/chrome/browser/extensions/requirements_checker_browsertest.cc
index 30b01d610d1bb563aa0dfc9e7cab3f430e5a078f..73bbfbd2a1ff82c54359fd9333aaef478efd3bcc 100644
--- a/chrome/browser/extensions/requirements_checker_browsertest.cc
+++ b/chrome/browser/extensions/requirements_checker_browsertest.cc
@@ -17,7 +17,6 @@
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_file_util.h"
-#include "chrome/test/base/test_launcher_utils.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/gpu_data_manager.h"
 #include "gpu/config/gpu_info.h"
@@ -29,16 +28,6 @@ namespace extensions {
 
 class RequirementsCheckerBrowserTest : public ExtensionBrowserTest {
  public:
-  virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
-    // We need to launch GPU process to decide if WebGL is allowed.
-    // Run it on top of osmesa to avoid bot driver issues.
-#if !defined(OS_MACOSX)
-    CHECK(test_launcher_utils::OverrideGLImplementation(
-        command_line, gfx::kGLImplementationOSMesaName)) <<
-        "kUseGL must not be set multiple times!";
-#endif
-  }
-
   scoped_refptr<const Extension> LoadExtensionFromDirName(
       const std::string& extension_dir_name) {
     base::FilePath extension_path;
@@ -190,4 +179,4 @@ IN_PROC_BROWSER_TEST_F(RequirementsCheckerBrowserTest, Check3DExtension) {
   content::BrowserThread::GetBlockingPool()->FlushForTesting();
 }
 
-}  // extensions
+}  // namespace extensions