Bump min picture version.

Chrome Stable is M39, which produces picture format v35:
    https://chromium.googlesource.com/skia/+/chrome/m39/include/core/SkPicture.h

We don't need any code to deal with pictures older than v35.

(When M40 goes stable, we can step up to v37, the current latest version.)

BUG=skia:

Review URL: https://codereview.chromium.org/770703002
diff --git a/src/effects/SkDashPathEffect.cpp b/src/effects/SkDashPathEffect.cpp
index 412965e..f31d883 100644
--- a/src/effects/SkDashPathEffect.cpp
+++ b/src/effects/SkDashPathEffect.cpp
@@ -52,7 +52,7 @@
     rect->outset(radius, radius);
 }
 
-// Attempt to trim the line to minimally cover the cull rect (currently 
+// Attempt to trim the line to minimally cover the cull rect (currently
 // only works for horizontal and vertical lines).
 // Return true if processing should continue; false otherwise.
 static bool cull_line(SkPoint* pts, const SkStrokeRec& rec,
@@ -377,16 +377,7 @@
         , fInitialDashLength(0)
         , fInitialDashIndex(0)
         , fIntervalLength(0) {
-    bool useOldPic = buffer.isVersionLT(SkReadBuffer::kDashWritesPhaseIntervals_Version);
-    if (useOldPic) {
-        fInitialDashIndex = buffer.readInt();
-        fInitialDashLength = buffer.readScalar();
-        fIntervalLength = buffer.readScalar();
-        buffer.readBool(); // Dummy for old ScalarToFit field
-    } else {
-        fPhase = buffer.readScalar();
-    }
-
+    fPhase = buffer.readScalar();
     fCount = buffer.getArrayCount();
     size_t allocSize = sizeof(SkScalar) * fCount;
     if (buffer.validateAvailable(allocSize)) {
@@ -396,20 +387,10 @@
         fIntervals = NULL;
     }
 
-    if (useOldPic) {
-        fPhase = 0;
-        if (fInitialDashLength != -1) { // Signal for bad dash interval
-            for (int i = 0; i < fInitialDashIndex; ++i) {
-                fPhase += fIntervals[i];
-            }
-            fPhase += fIntervals[fInitialDashIndex] - fInitialDashLength;
-        }
-    } else {
-        // set the internal data members, fPhase should have been between 0 and intervalLength
-        // when written to buffer so no need to adjust it
-        SkDashPath::CalcDashParameters(fPhase, fIntervals, fCount,
-                &fInitialDashLength, &fInitialDashIndex, &fIntervalLength);
-    }
+    // set the internal data members, fPhase should have been between 0 and intervalLength
+    // when written to buffer so no need to adjust it
+    SkDashPath::CalcDashParameters(fPhase, fIntervals, fCount,
+                                   &fInitialDashLength, &fInitialDashIndex, &fIntervalLength);
 }
 #endif