Remove third_party/golang.org/x/mobile as it is no longer used with Go 1.5.

third_party/go/src/golang.org/x/mobile/app/darwin_arm.m

-// Copyright 2015 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build darwin
-
-#include "_cgo_export.h"
-#include <pthread.h>
-#include <stdio.h>
-#include <sys/utsname.h>
-
-#import <UIKit/UIKit.h>
-#import <GLKit/GLKit.h>
-
-struct utsname sysInfo;
-
-@interface AppController : GLKViewController
-@end
-
-@interface AppDelegate : UIResponder<UIApplicationDelegate>
-@property (strong, nonatomic) UIWindow *window;
-@property (strong, nonatomic) AppController *controller;
-@end
-
-@implementation AppDelegate
-- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
-        self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
-        self.controller = [[AppController alloc] initWithNibName:nil bundle:nil];
-        self.window.rootViewController = self.controller;
-        [self.window makeKeyAndVisible];
-        return YES;
-}
-@end
-
-@interface AppController ()
-@property (strong, nonatomic) EAGLContext *context;
-@end
-
-@implementation AppController
-- (void)viewDidLoad {
-        [super viewDidLoad];
-        self.context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
-        GLKView *view = (GLKView *)self.view;
-        view.context = self.context;
-        view.drawableDepthFormat = GLKViewDrawableDepthFormat24;
-
-        // TODO(crawshaw): set correct geometry.
-        //CGRect bounds = view.bounds;
-        //view.contentScaleFactor;
-        setGeom(300, 300);
-}
-- (void)update {
-        NSLog(@"AppController update");
-        drawgl((GoUintptr)self.context);
-}
-@end
-
-void runApp(void) {
-        @autoreleasepool {
-                UIApplicationMain(0, nil, nil, NSStringFromClass([AppDelegate class]));
-        }
-}
-
-void setContext(void* context) {
-        EAGLContext* ctx = (EAGLContext*)context;
-        if (![EAGLContext setCurrentContext:ctx]) {
-                // TODO(crawshaw): determine how terrible this is. Exit?
-                NSLog(@"failed to set current context");
-        }
-}
-
-uint64_t threadID() {
-        uint64_t id;
-        if (pthread_threadid_np(pthread_self(), &id)) {
-                abort();
-        }
-        return id;
-}