Remove static thread pointers from CC

cc/font_atlas.cc

Index: cc/font_atlas.cc
diff --git a/cc/font_atlas.cc b/cc/font_atlas.cc
index 0b483c9bb04c4e35940d29fa81b6452d7333f2a9..b9d8e23e95bb8b536b5cb9a519b66499141c5901 100644
--- a/cc/font_atlas.cc
+++ b/cc/font_atlas.cc
@@ -31,7 +31,7 @@ FontAtlas::~FontAtlas()
 
 void FontAtlas::drawText(SkCanvas* canvas, const SkPaint& paint, const std::string& text, const gfx::Point& destPosition, const IntSize& clip) const
 {
-    DCHECK(Proxy::isImplThread());
+    DCHECK(m_threadChecker.CalledOnValidThread());
 
     std::vector<std::string> lines;
     base::SplitString(text, '\n', &lines);
@@ -47,7 +47,7 @@ void FontAtlas::drawText(SkCanvas* canvas, const SkPaint& paint, const std::stri
 
 void FontAtlas::drawOneLineOfTextInternal(SkCanvas* canvas, const SkPaint& paint, const std::string& textLine, const gfx::Point& destPosition) const
 {
-    DCHECK(Proxy::isImplThread());
+    DCHECK(m_threadChecker.CalledOnValidThread());
 
     gfx::Point position = destPosition;
     for (unsigned i = 0; i < textLine.length(); ++i) {
@@ -62,7 +62,7 @@ void FontAtlas::drawOneLineOfTextInternal(SkCanvas* canvas, const SkPaint& paint
 
 void FontAtlas::drawDebugAtlas(SkCanvas* canvas, const gfx::Point& destPosition) const
 {
-    DCHECK(Proxy::isImplThread());
+    DCHECK(m_threadChecker.CalledOnValidThread());
 
     SkIRect source = SkIRect::MakeWH(m_atlas.width(), m_atlas.height());
     canvas->drawBitmapRect(m_atlas, &source, SkRect::MakeXYWH(destPosition.x(), destPosition.y(), m_atlas.width(), m_atlas.height()));