Drop the [Immutable] IDL extended attribute (it is a no-op)

third_party/WebKit/Source/core/css/WebKitCSSMatrix.idl

Index: third_party/WebKit/Source/core/css/WebKitCSSMatrix.idl
diff --git a/third_party/WebKit/Source/core/css/WebKitCSSMatrix.idl b/third_party/WebKit/Source/core/css/WebKitCSSMatrix.idl
index 5a3c20ba95bec5545fd0b0f58ca8bc250e251e1a..b43ec0689f3f0d80b8fa32466aca0780a34a8e47 100644
--- a/third_party/WebKit/Source/core/css/WebKitCSSMatrix.idl
+++ b/third_party/WebKit/Source/core/css/WebKitCSSMatrix.idl
@@ -60,46 +60,46 @@
     [RaisesException] void setMatrixValue([Default=Undefined] optional DOMString string);
 
     // Multiply this matrix by secondMatrix, on the right (result = this * secondMatrix)
-    [Immutable, LegacyInterfaceTypeChecking] WebKitCSSMatrix multiply([Default=Undefined] optional WebKitCSSMatrix secondMatrix);
+    [LegacyInterfaceTypeChecking] WebKitCSSMatrix multiply([Default=Undefined] optional WebKitCSSMatrix secondMatrix);
 
     // Return the inverse of this matrix. Throw an exception if the matrix is not invertible
-    [Immutable, RaisesException] WebKitCSSMatrix inverse();
+    [RaisesException] WebKitCSSMatrix inverse();
 
     // Return this matrix translated by the passed values.
     // Passing a NaN will use a value of 0. This allows the 3D form to used for 2D operations
-    [Immutable] WebKitCSSMatrix translate([Default=Undefined] optional unrestricted double x,
-                                          [Default=Undefined] optional unrestricted double y,
-                                          [Default=Undefined] optional unrestricted double z);
+    WebKitCSSMatrix translate([Default=Undefined] optional unrestricted double x,
+                              [Default=Undefined] optional unrestricted double y,
+                              [Default=Undefined] optional unrestricted double z);
 
     // Returns this matrix scaled by the passed values.
     // Passing scaleX or scaleZ as NaN uses a value of 1, but passing scaleY of NaN
     // makes it the same as scaleX. This allows the 3D form to used for 2D operations
-    [Immutable] WebKitCSSMatrix scale([Default=Undefined] optional unrestricted double scaleX,
-                                      [Default=Undefined] optional unrestricted double scaleY,
-                                      [Default=Undefined] optional unrestricted double scaleZ);
+    WebKitCSSMatrix scale([Default=Undefined] optional unrestricted double scaleX,
+                          [Default=Undefined] optional unrestricted double scaleY,
+                          [Default=Undefined] optional unrestricted double scaleZ);
 
     // Returns this matrix rotated by the passed values.
     // If rotY and rotZ are NaN, rotate about Z (rotX=0, rotateY=0, rotateZ=rotX).
     // Otherwise use a rotation value of 0 for any passed NaN.
-    [Immutable] WebKitCSSMatrix rotate([Default=Undefined] optional unrestricted double rotX,
-                                       [Default=Undefined] optional unrestricted double rotY,
-                                       [Default=Undefined] optional unrestricted double rotZ);
+    WebKitCSSMatrix rotate([Default=Undefined] optional unrestricted double rotX,
+                           [Default=Undefined] optional unrestricted double rotY,
+                           [Default=Undefined] optional unrestricted double rotZ);
 
     // Returns this matrix rotated about the passed axis by the passed angle.
     // Passing a NaN will use a value of 0. If the axis is (0,0,0) use a value
     // of (0,0,1).
-    [Immutable] WebKitCSSMatrix rotateAxisAngle([Default=Undefined] optional unrestricted double x,
-                                                [Default=Undefined] optional unrestricted double y,
-                                                [Default=Undefined] optional unrestricted double z,
-                                                [Default=Undefined] optional unrestricted double angle);
+    WebKitCSSMatrix rotateAxisAngle([Default=Undefined] optional unrestricted double x,
+                                    [Default=Undefined] optional unrestricted double y,
+                                    [Default=Undefined] optional unrestricted double z,
+                                    [Default=Undefined] optional unrestricted double angle);
 
     // Returns this matrix skewed along the X axis by the passed values.
     // Passing a NaN will use a value of 0.
-    [Immutable] WebKitCSSMatrix skewX([Default=Undefined] optional unrestricted double angle);
+    WebKitCSSMatrix skewX([Default=Undefined] optional unrestricted double angle);
 
     // Returns this matrix skewed along the Y axis by the passed values.
     // Passing a NaN will use a value of 0.
-    [Immutable] WebKitCSSMatrix skewY([Default=Undefined] optional unrestricted double angle);
+    WebKitCSSMatrix skewY([Default=Undefined] optional unrestricted double angle);
 
     [NotEnumerable] stringifier;
 };