Initialize GPU shader disk cache on brower thread.

content/test/run_all_unittests.cc

Index: content/test/run_all_unittests.cc
diff --git a/content/test/run_all_unittests.cc b/content/test/run_all_unittests.cc
index 58e33047b25b9d31f38e89c3e4d33d56bcc36a85..78d2c74e20a8d6213c6521d8748a7461954a1347 100644
--- a/content/test/run_all_unittests.cc
+++ b/content/test/run_all_unittests.cc
@@ -18,10 +18,6 @@ int main(int argc, char** argv) {
 #if defined(OS_ANDROID)
   // Register JNI bindings for android.
   base::RegisterContentUriTestUtils(base::android::AttachCurrentThread());
-
-  // Android wants to call GetChannelId() (even though GPU channels
-  // are not getting created in content_unittests).
-  content::BrowserGpuChannelHostFactory::Initialize(false);
 #endif
 #if !defined(OS_IOS)
   content::InitializeMojo();