Remove non-impl-side painting as an option for blink.

content/public/common/content_switches.h

Index: content/public/common/content_switches.h
diff --git a/content/public/common/content_switches.h b/content/public/common/content_switches.h
index 72ac49314dabac750248264f21b846b74afede64..5361e6185ba6dee425704166dc812118833957c5 100644
--- a/content/public/common/content_switches.h
+++ b/content/public/common/content_switches.h
@@ -58,7 +58,6 @@ CONTENT_EXPORT extern const char kDisableLowResTiling[];
 CONTENT_EXPORT extern const char kDisableHangMonitor[];
 CONTENT_EXPORT extern const char kDisableHideInactiveStackedTabCloseButtons[];
 extern const char kDisableHistogramCustomizer[];
-CONTENT_EXPORT extern const char kDisableImplSidePainting[];
 CONTENT_EXPORT extern const char kDisableJava[];
 CONTENT_EXPORT extern const char kDisableLCDText[];
 CONTENT_EXPORT extern const char kDisablePrefixedEncryptedMedia[];
@@ -99,7 +98,6 @@ CONTENT_EXPORT extern const char kEnableCredentialManagerAPI[];
 CONTENT_EXPORT extern const char kEnablePreferCompositingToLCDText[];
 CONTENT_EXPORT extern const char kEnableBlinkFeatures[];
 CONTENT_EXPORT extern const char kEnableBrowserSideNavigation[];
-CONTENT_EXPORT extern const char kEnableDeferredImageDecoding[];
 CONTENT_EXPORT extern const char kEnableDelayAgnosticAec[];
 CONTENT_EXPORT extern const char kEnableDelegatedRenderer[];
 CONTENT_EXPORT extern const char kEnableDisplayList2dCanvas[];