Change MD notification action color to GoogleBlue600.

I chatted with Shiba and Sebastian about this after looking at
screenshots of Android Messages inline reply. It seems like
600 is the right match with the MD2 spec.

R=stevenjb@chromium.org

Bug: None
Change-Id: I2e66180eb752049abf19452fd02cbe103cb516a4
Reviewed-on: https://chromium-review.googlesource.com/1185843Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Jeremy Klein <jlklein@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585280}

ui/message_center/views/notification_view_md.cc

@@ -82,7 +82,7 @@ const float kActionButtonInkDropRippleVisibleOpacity = 0.08f;
 // Highlight (hover) ink drop opacity of action buttons.
 const float kActionButtonInkDropHighlightVisibleOpacity = 0.08f;
 // Text color of action button.
-constexpr SkColor kActionButtonTextColor = gfx::kGoogleBlue700;
+constexpr SkColor kActionButtonTextColor = gfx::kGoogleBlue600;
 // Background color of the large image.
 constexpr SkColor kLargeImageBackgroundColor = SkColorSetRGB(0xf5, 0xf5, 0xf5);
 
@@ -430,7 +430,7 @@ NotificationInputContainerMD::CreateInkDropRipple() const {
 }
 
 SkColor NotificationInputContainerMD::GetInkDropBaseColor() const {
-  return gfx::kGoogleBlue700;
+  return gfx::kGoogleBlue600;
 }
 
 bool NotificationInputContainerMD::HandleKeyEvent(views::Textfield* sender,

ui/message_center/views/notification_view_md_unittest.cc

@@ -757,7 +757,7 @@ TEST_F(NotificationViewMDTest, ExpandLongMessage) {
 }
 
 TEST_F(NotificationViewMDTest, TestAccentColor) {
-  constexpr SkColor kActionButtonTextColor = gfx::kGoogleBlue700;
+  constexpr SkColor kActionButtonTextColor = gfx::kGoogleBlue600;
   constexpr SkColor kCustomAccentColor = gfx::kGoogleYellow900;
 
   std::unique_ptr<Notification> notification = CreateSimpleNotification();