Make the FloatSize constructor from an IntSize explicit.

third_party/WebKit/Source/web/tests/VisualViewportTest.cpp

Index: third_party/WebKit/Source/web/tests/VisualViewportTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/VisualViewportTest.cpp b/third_party/WebKit/Source/web/tests/VisualViewportTest.cpp
index 9d2e7f75a97bf1fe00631c36315fe442ede3feda..3e54d0fa694925fbc891fc0633a986c0d2fd1979 100644
--- a/third_party/WebKit/Source/web/tests/VisualViewportTest.cpp
+++ b/third_party/WebKit/Source/web/tests/VisualViewportTest.cpp
@@ -459,7 +459,7 @@ TEST_P(ParameterizedVisualViewportTest, TestVisibleRect)
     visualViewport.setSize(size);
 
     // Scale the viewport to 2X; size should not change.
-    FloatRect expectedRect(FloatPoint(0, 0), size);
+    FloatRect expectedRect(FloatPoint(0, 0), FloatSize(size));
     expectedRect.scale(0.5);
     visualViewport.setScale(2);
     EXPECT_EQ(2, visualViewport.scale());
@@ -477,7 +477,7 @@ TEST_P(ParameterizedVisualViewportTest, TestVisibleRect)
 
     // Scale the viewport to 3X to introduce some non-int values.
     FloatPoint oldLocation = expectedRect.location();
-    expectedRect = FloatRect(FloatPoint(), size);
+    expectedRect = FloatRect(FloatPoint(), FloatSize(size));
     expectedRect.scale(1 / 3.0f);
     expectedRect.setLocation(oldLocation);
     visualViewport.setScale(3);