Revert of add peekPixels to SkCanvas and SkSurface

src/core/SkDevice.cpp

Index: src/core/SkDevice.cpp
diff --git a/src/core/SkDevice.cpp b/src/core/SkDevice.cpp
index 364b106dd8feb023fd8223efdf6e838809a28778..9ce8b6b5df2e2a002bbd7fee9d5836df557c244d 100644
--- a/src/core/SkDevice.cpp
+++ b/src/core/SkDevice.cpp
@@ -65,12 +65,6 @@
     return *fMetaData;
 }
 
-// TODO: should make this guy pure-virtual.
-SkImageInfo SkBaseDevice::imageInfo() const {
-    return SkImageInfo::Make(this->width(), this->height(),
-                             kUnknown_SkColorType, kIgnore_SkAlphaType);
-}
-
 const SkBitmap& SkBaseDevice::accessBitmap(bool changePixels) {
     const SkBitmap& bitmap = this->onAccessBitmap();
     if (changePixels) {
@@ -123,5 +117,3 @@
 }
 
 SkSurface* SkBaseDevice::newSurface(const SkImageInfo&) { return NULL; }
-
-const void* SkBaseDevice::peekPixels(SkImageInfo*, size_t*) { return NULL; }