libgui: Fix the tests so they build.

Change-Id: I7205b0819e5801ac549109ff562c3ab1b113d176
diff --git a/libs/gui/tests/SurfaceTexture_test.cpp b/libs/gui/tests/SurfaceTexture_test.cpp
index 4184463..6c71343 100644
--- a/libs/gui/tests/SurfaceTexture_test.cpp
+++ b/libs/gui/tests/SurfaceTexture_test.cpp
@@ -76,7 +76,7 @@
             mComposerClient = new SurfaceComposerClient;
             ASSERT_EQ(NO_ERROR, mComposerClient->initCheck());
 
-            mSurfaceControl = mComposerClient->createSurface(getpid(),
+            mSurfaceControl = mComposerClient->createSurface(
                     String8("Test Surface"), 0,
                     getSurfaceWidth(), getSurfaceHeight(),
                     PIXEL_FORMAT_RGB_888, 0);