Update app menu button MD colors for the notification case.

ui/gfx/color_palette.h

Index: ui/gfx/color_palette.h
diff --git a/ui/gfx/color_palette.h b/ui/gfx/color_palette.h
index 8b93e7b0afb50c10ab14a3543bc90d2f30232c72..dce2511d93f9ba59810474cd7209b2686f5cfdb1 100644
--- a/ui/gfx/color_palette.h
+++ b/ui/gfx/color_palette.h
@@ -11,8 +11,10 @@ namespace gfx {
 
 const SkColor kAmber = SkColorSetRGB(0xFF, 0xC1, 0x07);
 const SkColor kChromeIconGrey = SkColorSetRGB(0x5A, 0x5A, 0x5A);
-const SkColor kErrorRed = SkColorSetRGB(0xC5, 0x39, 0x29);
 const SkColor kGoogleBlue = SkColorSetRGB(0x42, 0x85, 0xF4);
+const SkColor kGoogleRed700 = SkColorSetRGB(0xC5, 0x39, 0x29);

[sky, 2015/10/07 23:41:52]

It's not clear to me why these have 700 in the name? The 700 club? I'm sure
there is some good reason. It's worth documenting that.

[Evan Stade, 2015/10/08 00:03:31]

Apparently it's an arbitrary nomenclature dreamt up for material design:
http://www.materialui.co/colors

Docs added.

+const SkColor kGoogleGreen700 = SkColorSetRGB(0x0B, 0x80, 0x43);
+const SkColor kGoogleYellow700 = SkColorSetRGB(0xF0, 0x93, 0x00);
 
 }  // namespace gfx