Remove carriage returns.

Also add a presubmit so they don't get added to source code.

Change-Id: I6a85c6a934b1068a63646a0dcc0d3a08baa96ced
Reviewed-on: https://skia-review.googlesource.com/57110
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
diff --git a/docs/SkPixmap_Reference.bmh b/docs/SkPixmap_Reference.bmh
index 09fb1a6..837d3af 100644
--- a/docs/SkPixmap_Reference.bmh
+++ b/docs/SkPixmap_Reference.bmh
@@ -799,14 +799,14 @@
         }
     }
 #StdOut
-width:       1 height:       1 computeByteSize:             4

-width:       1 height:    1000 computeByteSize:          4999

-width:       1 height: 1000000 computeByteSize:       4999999

-width:    1000 height:       1 computeByteSize:          4000

-width:    1000 height:    1000 computeByteSize:       4999000

-width:    1000 height: 1000000 computeByteSize:    4999999000

-width: 1000000 height:       1 computeByteSize:       4000000

-width: 1000000 height:    1000 computeByteSize:    4999000000

+width:       1 height:       1 computeByteSize:             4
+width:       1 height:    1000 computeByteSize:          4999
+width:       1 height: 1000000 computeByteSize:       4999999
+width:    1000 height:       1 computeByteSize:          4000
+width:    1000 height:    1000 computeByteSize:       4999000
+width:    1000 height: 1000000 computeByteSize:    4999999000
+width: 1000000 height:       1 computeByteSize:       4000000
+width: 1000000 height:    1000 computeByteSize:    4999000000
 width: 1000000 height: 1000000 computeByteSize: 4999999000000
 ##
 ##