Make SpdyFrame::size a constant instead of a static method so gcc can optimize the call away.

net/spdy/spdy_protocol.h

Index: net/spdy/spdy_protocol.h
diff --git a/net/spdy/spdy_protocol.h b/net/spdy/spdy_protocol.h
index eed9798b0021a898ad269eaf2dd209b51df9a549..2519814f182d1888f073add57dbe13bc5674c253 100644
--- a/net/spdy/spdy_protocol.h
+++ b/net/spdy/spdy_protocol.h
@@ -383,11 +383,11 @@ class SpdyFrame {
         kControlFlagMask;
   }
 
-  // Returns the size of the SpdyFrameBlock structure.
+  // The size of the SpdyFrameBlock structure.
   // Every SpdyFrame* class has a static size() method for accessing
   // the size of the data structure which will be sent over the wire.
   // Note:  this is not the same as sizeof(SpdyFrame).
-  static size_t size() { return sizeof(struct SpdyFrameBlock); }
+  enum { kHeaderSize = sizeof(struct SpdyFrameBlock) };
 
  protected:
   SpdyFrameBlock* frame_;
@@ -418,7 +418,7 @@ class SpdyDataFrame : public SpdyFrame {
 
   // Returns the size of the SpdyFrameBlock structure.
   // Note: this is not the size of the SpdyDataFrame class.
-  static size_t size() { return SpdyFrame::size(); }
+  static size_t size() { return SpdyFrame::kHeaderSize; }
 
   const char* payload() const {
     return reinterpret_cast<const char*>(frame_) + size();
@@ -522,7 +522,7 @@ class SpdySynStreamControlFrame : public SpdyControlFrame {
 
   // The number of bytes in the header block beyond the frame header length.
   int header_block_len() const {
-    return length() - (size() - SpdyFrame::size());
+    return length() - (size() - SpdyFrame::kHeaderSize);
   }
 
   const char* header_block() const {
@@ -559,7 +559,7 @@ class SpdySynReplyControlFrame : public SpdyControlFrame {
   }
 
   int header_block_len() const {
-    return length() - (size() - SpdyFrame::size());
+    return length() - (size() - SpdyFrame::kHeaderSize);
   }
 
   const char* header_block() const {
@@ -636,7 +636,7 @@ class SpdySettingsControlFrame : public SpdyControlFrame {
   }
 
   int header_block_len() const {
-    return length() - (size() - SpdyFrame::size());
+    return length() - (size() - SpdyFrame::kHeaderSize);
   }
 
   const char* header_block() const {
@@ -734,7 +734,7 @@ class SpdyHeadersControlFrame : public SpdyControlFrame {
 
   // The number of bytes in the header block beyond the frame header length.
   int header_block_len() const {
-    return length() - (size() - SpdyFrame::size());
+    return length() - (size() - SpdyFrame::kHeaderSize);
   }
 
   const char* header_block() const {