Move Tuple to base namespace.

printing/pdf_render_settings.h

Index: printing/pdf_render_settings.h
diff --git a/printing/pdf_render_settings.h b/printing/pdf_render_settings.h
index 85bf00e5705e4534341c6ef9294340db9127223d..3f8f38bab3b0b844e25b0f0ac4faf69fafd40fac 100644
--- a/printing/pdf_render_settings.h
+++ b/printing/pdf_render_settings.h
@@ -16,7 +16,7 @@ namespace printing {
 // gfx::Rect - render area
 // int - render dpi
 // bool - autorotate pages to fit paper
-typedef Tuple<gfx::Rect, int, bool> PdfRenderSettingsBase;
+typedef base::Tuple<gfx::Rect, int, bool> PdfRenderSettingsBase;
 
 class PdfRenderSettings : public PdfRenderSettingsBase {
  public:
@@ -25,9 +25,9 @@ class PdfRenderSettings : public PdfRenderSettingsBase {
       : PdfRenderSettingsBase(area, dpi, autorotate) {}
   ~PdfRenderSettings() {}
 
-  const gfx::Rect& area() const { return ::get<0>(*this); }
-  int dpi() const { return ::get<1>(*this); }
-  bool autorotate() const { return ::get<2>(*this); }
+  const gfx::Rect& area() const { return base::get<0>(*this); }
+  int dpi() const { return base::get<1>(*this); }
+  bool autorotate() const { return base::get<2>(*this); }
 };
 
 }  // namespace printing