Revert 98230 - CL removing inheritance of SkDevice from PlatformDevice.

skia/ext/bitmap_platform_device_linux.cc

Index: skia/ext/bitmap_platform_device_linux.cc
===================================================================
--- skia/ext/bitmap_platform_device_linux.cc	(revision 98232)
+++ skia/ext/bitmap_platform_device_linux.cc	(working copy)
@@ -120,9 +120,8 @@
 BitmapPlatformDevice::BitmapPlatformDevice(
     const SkBitmap& bitmap,
     BitmapPlatformDeviceData* data)
-    : SkDevice(bitmap),
+    : PlatformDevice(bitmap),
       data_(data) {
-  SetPlatformDevice(this, this);
 }
 
 BitmapPlatformDevice::~BitmapPlatformDevice() {
@@ -147,12 +146,6 @@
   return cairo;
 }
 
-void BitmapPlatformDevice::DrawToNativeContext(
-    PlatformSurface surface, int x, int y, const PlatformRect* src_rect) {
-  // Should never be called on Linux.
-  SkASSERT(false);
-}
-
 void BitmapPlatformDevice::setMatrixClip(const SkMatrix& transform,
                                          const SkRegion& region,
                                          const SkClipStack&) {