[blink] Use early returns in baseBackgroundColor(Override) setters.

third_party/WebKit/Source/web/WebViewImpl.cpp

Index: third_party/WebKit/Source/web/WebViewImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebViewImpl.cpp b/third_party/WebKit/Source/web/WebViewImpl.cpp
index f6586700e856de30197df47465adfd35b72ab985..19ba33f5a6e79093d6682ff64b1fb65c5c9340c4 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.cpp
+++ b/third_party/WebKit/Source/web/WebViewImpl.cpp
@@ -3597,6 +3597,11 @@ void WebViewImpl::setBaseBackgroundColor(WebColor color) {
 }
 
 void WebViewImpl::setBaseBackgroundColorOverride(WebColor color) {
+  if (m_baseBackgroundColorOverrideEnabled &&
+      m_baseBackgroundColorOverride == color) {
+    return;
+  }
+
   m_baseBackgroundColorOverrideEnabled = true;
   m_baseBackgroundColorOverride = color;
   if (mainFrameImpl()) {
@@ -3611,6 +3616,9 @@ void WebViewImpl::setBaseBackgroundColorOverride(WebColor color) {
 }
 
 void WebViewImpl::clearBaseBackgroundColorOverride() {
+  if (!m_baseBackgroundColorOverrideEnabled)
+    return;
+
   m_baseBackgroundColorOverrideEnabled = false;
   if (mainFrameImpl()) {
     // Force lifecycle update to ensure we're good to call