Revert of Add OpenGL support to Linux viewer

tools/viewer/sk_app/unix/Window_unix.h

Index: tools/viewer/sk_app/unix/Window_unix.h
diff --git a/tools/viewer/sk_app/unix/Window_unix.h b/tools/viewer/sk_app/unix/Window_unix.h
index fb6b22d4132a4e09ed056528bc6b298cb2588e84..c2156fc6aecf1e3e5b2fc86db4dd1f3553bf4f43 100644
--- a/tools/viewer/sk_app/unix/Window_unix.h
+++ b/tools/viewer/sk_app/unix/Window_unix.h
@@ -9,7 +9,6 @@
 #define Window_unix_DEFINED
 
 #include <X11/Xlib.h>
-#include <GL/glx.h>
 #include "../Window.h"
 #include "SkChecksum.h"
 #include "SkTDynamicHash.h"
@@ -19,22 +18,17 @@
 namespace sk_app {
 
 struct ContextPlatformData_unix {
-    Display*     fDisplay;
-    XWindow      fWindow;
-    XVisualInfo* fVisualInfo;
+    Display* fDisplay;
+    XWindow  fHWnd;
+    VisualID fVisualID;
 };
 
 class Window_unix : public Window {
 public:
-    Window_unix() : Window()
-                  , fDisplay(nullptr)
-                  , fWindow(0)
-                  , fGC(nullptr)
-                  , fVisualInfo(nullptr)
-                  , fMSAASampleCount(0) {}
-    ~Window_unix() override { this->closeWindow(); }
+    Window_unix() : Window() {}
+    ~Window_unix() override {}
 
-    bool initWindow(Display* display, const DisplayParams* params);
+    bool init(Display* display);
 
     void setTitle(const char*) override;
     void show() override;
@@ -46,7 +40,7 @@
     bool handleEvent(const XEvent& event);
 
     static const XWindow& GetKey(const Window_unix& w) {
-        return w.fWindow;
+        return w.fHWnd;
     }
 
     static uint32_t Hash(const XWindow& w) {
@@ -76,13 +70,8 @@
     }
 
 private:
-    void closeWindow();
-
-    Display*     fDisplay;
-    XWindow      fWindow;
-    GC           fGC;
-    XVisualInfo* fVisualInfo;
-    int          fMSAASampleCount;
+    Display* fDisplay;
+    XWindow  fHWnd;
 
     Atom     fWmDeleteMessage;