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/font/font_darwin.go

-// Copyright 2014 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.
-
-package font
-
-/*
-#cgo darwin LDFLAGS: -framework CoreFoundation -framework CoreText
-#include <CoreFoundation/CFArray.h>
-#include <CoreFoundation/CFBase.h>
-#include <CoreFoundation/CFData.h>
-#include <CoreText/CTFont.h>
-*/
-import "C"
-import "unsafe"
-
-func buildFont(f C.CTFontRef) []byte {
-        ctags := C.CTFontCopyAvailableTables(f, C.kCTFontTableOptionExcludeSynthetic)
-        tagsCount := C.CFArrayGetCount(ctags)
-
-        var tags []uint32
-        var dataRefs []C.CFDataRef
-        var dataLens []uint32
-
-        for i := C.CFIndex(0); i < tagsCount; i++ {
-                tag := (C.CTFontTableTag)((uintptr)(C.CFArrayGetValueAtIndex(ctags, i)))
-                dataRef := C.CTFontCopyTable(f, tag, 0) // retained
-                tags = append(tags, uint32(tag))
-                dataRefs = append(dataRefs, dataRef)
-                dataLens = append(dataLens, uint32(C.CFDataGetLength(dataRef)))
-        }
-
-        totalLen := 0
-        for _, l := range dataLens {
-                totalLen += int(l)
-        }
-
-        // Big-endian output.
-        buf := make([]byte, 0, 12+16*len(tags)+totalLen)
-        write16 := func(x uint16) { buf = append(buf, byte(x>>8), byte(x)) }
-        write32 := func(x uint32) { buf = append(buf, byte(x>>24), byte(x>>16), byte(x>>8), byte(x)) }
-
-        // File format description: http://www.microsoft.com/typography/otspec/otff.htm
-        write32(0x00010000)        // version 1.0
-        write16(uint16(len(tags))) // numTables
-        write16(0)                 // searchRange
-        write16(0)                 // entrySelector
-        write16(0)                 // rangeShift
-
-        // Table tags, includes offsets into following data segments.
-        offset := uint32(12 + 16*len(tags)) // offset starts after table tags
-        for i, tag := range tags {
-                write32(tag)
-                write32(0)
-                write32(offset)
-                write32(dataLens[i])
-                offset += dataLens[i]
-        }
-
-        // Data segments.
-        for i, dataRef := range dataRefs {
-                data := (*[1<<31 - 2]byte)((unsafe.Pointer)(C.CFDataGetBytePtr(dataRef)))[:dataLens[i]]
-                buf = append(buf, data...)
-                C.CFRelease(C.CFTypeRef(dataRef))
-        }
-
-        return buf
-}
-
-func buildDefault() ([]byte, error) {
-        return buildFont(C.CTFontCreateUIFontForLanguage(C.kCTFontSystemFontType, 0, nil)), nil
-}
-
-func buildMonospace() ([]byte, error) {
-        return buildFont(C.CTFontCreateUIFontForLanguage(C.kCTFontUserFixedPitchFontType, 0, nil)), nil
-}