SK_DECLARE_STATIC_MUTEX -> static SkMutex

tools/gpu/gl/command_buffer/GLTestContext_command_buffer.cpp

Index: tools/gpu/gl/command_buffer/GLTestContext_command_buffer.cpp
diff --git a/tools/gpu/gl/command_buffer/GLTestContext_command_buffer.cpp b/tools/gpu/gl/command_buffer/GLTestContext_command_buffer.cpp
index 850adaaf257ace350b3962103bc05b5de5ead0cd..a6f62f0028dd1e6ccf086ce5cc164786f57fffd3 100644
--- a/tools/gpu/gl/command_buffer/GLTestContext_command_buffer.cpp
+++ b/tools/gpu/gl/command_buffer/GLTestContext_command_buffer.cpp
@@ -142,7 +142,7 @@ static const GrGLInterface* create_command_buffer_interface() {
 
 // We use a poor man's garbage collector of EGLDisplays. They are only
 // terminated when there are no more EGLDisplays in use. See crbug.com/603223
-SK_DECLARE_STATIC_MUTEX(gDisplayMutex);
+static SkMutex gDisplayMutex;
 static int gActiveDisplayCnt;
 SkTArray<EGLDisplay> gRetiredDisplays;