Blink Platform: Remove time functions from Platform.

content/child/blink_platform_impl.h

Index: content/child/blink_platform_impl.h
diff --git a/content/child/blink_platform_impl.h b/content/child/blink_platform_impl.h
index 4bfeb7e7ae57bab19cd10ae0817205759ba99d68..f123c19cbb6c8e28cd88d53c0819b1554739dd30 100644
--- a/content/child/blink_platform_impl.h
+++ b/content/child/blink_platform_impl.h
@@ -160,9 +160,6 @@ class CONTENT_EXPORT BlinkPlatformImpl
       const blink::WebString& value1,
       const blink::WebString& value2) override;
   void suddenTerminationChanged(bool enabled) override {}
-  double currentTimeSeconds() override;
-  double monotonicallyIncreasingTimeSeconds() override;
-  double systemTraceTime() override;
   void cryptographicallyRandomValues(unsigned char* buffer,
                                      size_t length) override;
   blink::WebThread* compositorThread() const override;